Merging r358547:
------------------------------------------------------------------------
r358547 | ruiu | 2019-04-16 19:12:47 -0700 (Tue, 16 Apr 2019) | 9 lines
Fix a crash bug caused by a nested call of parallelForEach.
parallelForEach is not reentrant. We use parallelForEach to call
each section's writeTo(), so calling the same function within writeTo()
is not safe.
Fixes https://bugs.llvm.org/show_bug.cgi?id=41508
Differential Revision: https://reviews.llvm.org/D60757
------------------------------------------------------------------------
llvm-svn: 360791
