Merge r314513 into the 5.0 branch

[hahnjo]

Bugzilla Link	34780
Resolution	FIXED
Resolved on	Oct 10, 2017 12:58
Version	unspecified
OS	All
Blocks	#33840
CC	@AndreyChurbanov,@tstellar
Fixed by commit(s)	r314513 r315353

Extended Description

Commit r314513 fixes an uninitialized variable in omp_taskloop_grainsize.c that has been seen while testing the 5.0.0 release: http://lists.llvm.org/pipermail/release-testers/2017-August/000526.html

[hahnjo]

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[tstellar]

Merged: r315353