The bot is unhappy:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fast/builds/7880/steps/build%20libcxx%2Fasan/logs/stdio
1/6] Building CXX object
projects/libcxxabi/src/CMakeFiles/cxxabi_objects.dir/cxa_exception.cpp.o
FAILED:
Author: phosek
Date: Wed Sep 13 16:35:07 2017
New Revision: 313215
URL: http://llvm.org/viewvc/llvm-project?rev=313215=rev
Log:
Reland "When built with ASan, __cxa_throw calls __asan_handle_no_return"
The ASan runtime on many systems intercepts cxa_throw just so it
can call asan_handle_no_return
