[ASan] make test for LSan annotations Linux-only for now

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@184541 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Add keep_going runtime flag.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@184542 91177308-0d34-0410-b5e6-96231b3b80d8