staticboolTest(intx)=>(x&1)==0;

Just a good first issue for anyone interested in contributing to CLR JIT.

Current codegen:

testcl,1setealmovzxrax,alret

Expected codegen:

moveax,ecxandeax,1ret

I noticed it when I was trying to implement a faster IsNegative for floats:

staticboolIsNegative(doublex)=>(Sse2.MoveMask(Vector128.CreateScalarUnsafe(x))&1)!=0;