[asan] Define LSan annotations as no-ops if leak detection is not supported.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@184422 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: fix potential false positive race on fd


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@184430 91177308-0d34-0410-b5e6-96231b3b80d8