Add DLL thunks for recently-added memcpy, memset and memmove ASan intrinsics

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@207113 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: stop background thread when sandbox is enabled
Fixes https://code.google.com/p/thread-sanitizer/issues/detail?id=56



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@207114 91177308-0d34-0410-b5e6-96231b3b80d8