[TSan] Add a comment that tsan_flags.h may be included in the user code, and therefore shouldn't include other headers from TSan or common sanitizer runtime. User may need tsan_flags.h to provide its implementation of __tsan::OverrideFlags

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@158708 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed