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optimize TimeStampCache.GetFileTimeStamp happy path (dotnet#5085)

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Lines changed: 5 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -2112,12 +2112,13 @@ type TimeStampCache(defaultTimeStamp: DateTime) =`
`2112`	`2112`	`letprojects= Dictionary<IProjectReference, DateTime>(HashIdentity.Reference)`
`2113`	`2113`	`membercache.GetFileTimeStamp fileName=`
`2114`	`2114`	`letok,v= files.TryGetValue(fileName)`
`2115`		`-if okthen velse`
	`2115`	`+if okthen velse`
`2116`	`2116`	`letv=`
`2117`		`-if FileSystem.SafeExists(fileName)then`
	`2117`	`+try`
`2118`	`2118`	`FileSystem.GetLastWriteTimeShim(fileName)`
`2119`		`-else`
`2120`		`- defaultTimeStamp`
	`2119`	`+with`
	`2120`	`+\|:? FileNotFoundException->`
	`2121`	`+ defaultTimeStamp`
`2121`	`2122`	`files.[fileName]<- v`
`2122`	`2123`	`v`
`2123`	`2124`

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