[LSan] Add the way to disable LSan at link time

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@185066 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] Fix dirent interceptors.

The new version reads d_reclen for (struct dirent) size.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@185067 91177308-0d34-0410-b5e6-96231b3b80d8