Fix minor gcc warnings.

C++ style comments not allowed in C90,
signed unsigned comparision.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@196948 91177308-0d34-0410-b5e6-96231b3b80d8
[TSan] Replace __tsan::OverrideFlags with __tsan::OnInitialize

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@197014 91177308-0d34-0410-b5e6-96231b3b80d8
[TSan] Move declarations of __tsan_atomic functions to a public header

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@197015 91177308-0d34-0410-b5e6-96231b3b80d8