[TSan] Add the WTFAnnotateBenignRaceSized implementation and a test for
WTFAnnotateBenignRaceSized and AnnotateBenignRaceSized.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178534 91177308-0d34-0410-b5e6-96231b3b80d8