tsan: remove bogus CHECK
Asynchronous signal (e.g. SIGABRT) can be received with any value of in_rtl.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@177636 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: intercept abort() to fflush() libc streams



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@177637 91177308-0d34-0410-b5e6-96231b3b80d8