tsan: remember when we are inside of symbolizer code (required for inprocess symbolizer)


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173796 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: support for inprocess symbolizer


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@173797 91177308-0d34-0410-b5e6-96231b3b80d8