Look through assertions when trying to get the array length if we don't have a better way.

This removes bounds checks in this form:

if(arr.Length>5){arr[4]=1;arr[i%5]=1;}if(arr.Length!=0){arr[0]=1;}

fixes#11623

Total bytes of diff: -12616 (-0.039% of base)    diff is an improvement.Top file improvements (bytes):       -4356 : System.Private.CoreLib.dasm (-0.134% of base)        -898 : System.Private.Xml.dasm (-0.028% of base)        -582 : Microsoft.VisualBasic.Core.dasm (-0.137% of base)        -500 : System.Data.Common.dasm (-0.045% of base)        -394 : Microsoft.CodeAnalysis.VisualBasic.dasm (-0.017% of base)        -381 : Microsoft.CodeAnalysis.CSharp.dasm (-0.018% of base)        -378 : Microsoft.CodeAnalysis.dasm (-0.049% of base)        -321 : FSharp.Core.dasm (-0.034% of base)        -278 : System.Private.DataContractSerialization.dasm (-0.038% of base)        -278 : System.Linq.Expressions.dasm (-0.010% of base)        -249 : Newtonsoft.Json.dasm (-0.040% of base)        -239 : System.Text.Json.dasm (-0.079% of base)        -206 : Microsoft.Diagnostics.Tracing.TraceEvent.dasm (-0.006% of base)        -201 : System.Runtime.Numerics.dasm (-0.291% of base)        -199 : System.Reflection.Metadata.dasm (-0.061% of base)        -198 : System.Net.Security.dasm (-0.072% of base)        -162 : System.Net.Http.dasm (-0.027% of base)        -148 : System.ComponentModel.TypeConverter.dasm (-0.066% of base)        -136 : System.ComponentModel.Composition.dasm (-0.063% of base)        -132 : System.Memory.dasm (-0.150% of base)72 total files with Code Size differences (72 improved, 0 regressed), 195 unchanged.Top method regressions (bytes):           8 (0.163% of base) : System.Data.Common.dasm - XSDSchema:LoadSchema(XmlSchemaSet,DataSet):this           2 (0.015% of base) : System.Data.Common.dasm - XmlTreeGen:HandleTable(DataTable,XmlDocument,XmlElement,bool):XmlElement:thisTop method improvements (bytes):        -366 (-23.033% of base) : System.Private.CoreLib.dasm - Utf8Parser:TryParseDateTimeOffsetO(ReadOnlySpan`1,byref,byref,byref):bool        -308 (-20.995% of base) : System.Private.CoreLib.dasm - Utf8Parser:TryParseDateTimeOffsetR(ReadOnlySpan`1,int,byref,byref):bool        -295 (-15.784% of base) : System.Private.CoreLib.dasm - DateTimeParse:ParseFormatR(ReadOnlySpan`1,byref,byref):bool        -199 (-24.121% of base) : System.Private.CoreLib.dasm - Utf8Parser:TryParseDateTimeG(ReadOnlySpan`1,byref,byref,byref):bool        -198 (-2.402% of base) : System.Private.CoreLib.dasm - Vector256`1:ToString():String:this (11 methods)        -198 (-2.492% of base) : System.Private.CoreLib.dasm - Vector64`1:ToString():String:this (11 methods)        -174 (-2.257% of base) : System.Private.CoreLib.dasm - Vector128`1:ToString():String:this (11 methods)         -86 (-23.056% of base) : System.Private.CoreLib.dasm - Rune:TryEncodeToUtf8(Span`1,byref):bool:this         -86 (-9.317% of base) : Microsoft.VisualBasic.Core.dasm - Strings:Format(Object,String):String         -83 (-20.048% of base) : System.Private.CoreLib.dasm - Utf8Parser:TryParseDateTimeOffsetDefault(ReadOnlySpan`1,byref,byref):bool         -78 (-16.810% of base) : System.Net.Security.dasm - SslStream:DetectFraming(ReadOnlySpan`1):int:this         -70 (-0.489% of base) : Microsoft.VisualBasic.Core.dasm - VBBinder:BindToMethod(int,ref,byref,ref,CultureInfo,ref,byref):MethodBase:this         -67 (-3.851% of base) : System.Memory.dasm - SequenceReader`1:TryReadToAnyInternal(byref,ReadOnlySpan`1,bool,int):bool:this (2 methods)         -66 (-2.891% of base) : System.Private.CoreLib.dasm - GenericArraySortHelper`1:HeapSort(Span`1) (13 methods)         -65 (-7.096% of base) : System.Memory.dasm - SequenceReader`1:TryReadToAny(byref,ReadOnlySpan`1,bool):bool:this (4 methods)         -60 (-1.823% of base) : Microsoft.Diagnostics.Tracing.TraceEvent.dasm - TraceEvent:PayloadString(int,IFormatProvider):String:this         -59 (-7.403% of base) : System.Net.HttpListener.dasm - HttpListenerRequest:SetRequestLine(String):this         -55 (-5.765% of base) : System.Private.CoreLib.dasm - DateTimeFormatInfo:SetAllDateTimePatterns(ref,ushort):this         -55 (-18.395% of base) : System.Net.Security.dasm - SslStream:GetFrameSize(ReadOnlySpan`1):int:this         -52 (-17.162% of base) : Microsoft.CodeAnalysis.dasm - PathUtilities:GetPathKind(String):intTop method regressions (percentages):           8 (0.163% of base) : System.Data.Common.dasm - XSDSchema:LoadSchema(XmlSchemaSet,DataSet):this           2 (0.015% of base) : System.Data.Common.dasm - XmlTreeGen:HandleTable(DataTable,XmlDocument,XmlElement,bool):XmlElement:thisTop method improvements (percentages):         -17 (-53.125% of base) : System.Collections.Immutable.dasm - ImmutableArrayExtensions:FirstOrDefault(ImmutableArray`1):__Canon         -17 (-43.590% of base) : System.Private.Xml.dasm - Compiler:IsPhantomNamespace(String):bool:this         -28 (-41.791% of base) : Microsoft.CodeAnalysis.CSharp.dasm - ExplicitInterfaceMethodTypeParameterMap:GetOverriddenMethod(SourceMemberMethodSymbol):MethodSymbol:this         -17 (-40.476% of base) : Microsoft.CodeAnalysis.CSharp.dasm - CodeGenerator:IsMultidimensionalInitializer(ImmutableArray`1):bool         -17 (-40.476% of base) : Microsoft.CodeAnalysis.VisualBasic.dasm - CodeGenerator:IsMultidimensionalInitializer(ImmutableArray`1):bool:this         -17 (-39.535% of base) : Newtonsoft.Json.Bson.dasm - StringUtils:StartsWith(String,ushort):bool         -17 (-39.535% of base) : Newtonsoft.Json.dasm - StringUtils:StartsWith(String,ushort):bool         -17 (-39.535% of base) : System.Private.Xml.dasm - Compiler:IsPhantomName(QilName):bool:this         -17 (-33.333% of base) : System.Data.Common.dasm - XmlDataDocument:GetNestedParentRelation(DataRow):DataRelation         -27 (-32.927% of base) : System.Collections.Immutable.dasm - ImmutableArrayExtensions:First(ImmutableArray`1):__Canon         -21 (-30.882% of base) : System.Private.Xml.dasm - CSharpHelpers:IsPrefixTwoUnderscore(String):bool         -21 (-30.882% of base) : System.CodeDom.dasm - CSharpHelpers:IsPrefixTwoUnderscore(String):bool         -11 (-29.730% of base) : Microsoft.VisualBasic.Core.dasm - CharType:FromString(String):ushort         -11 (-29.730% of base) : Microsoft.VisualBasic.Core.dasm - Conversions:ToChar(String):ushort         -16 (-29.630% of base) : Microsoft.CodeAnalysis.dasm - PathUtilities:IsDriveRootedAbsolutePath(String):bool         -11 (-27.500% of base) : Microsoft.VisualBasic.Core.dasm - FileSystem:ChDrive(String)         -11 (-25.000% of base) : System.Drawing.Common.dasm - Font:IsVerticalName(String):bool         -26 (-24.762% of base) : System.Private.Xml.dasm - XmlAutoDetectWriter:IsHtmlTag(String):bool         -11 (-24.444% of base) : System.Private.DataContractSerialization.dasm - XmlUTF8NodeWriter:WritePrefix(String):this         -21 (-24.419% of base) : System.Private.Xml.dasm - ValidateNames:StartsWithXml(String):bool672 total methods with Code Size differences (670 improved, 2 regressed), 190515 unchanged.