tsan: add a test for __tsan_default_options()



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@192873 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: merge 2 similar tests into 1



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@192874 91177308-0d34-0410-b5e6-96231b3b80d8