Merge r316824 into 5.0.1

[llvmbot]

Bugzilla Link	35117
Resolution	FIXED
Resolved on	Nov 13, 2017 14:30
Version	trunk
OS	Windows NT
Blocks	#33840
Reporter	LLVM Bugzilla Contributor
CC	@zmodem,@tstellar
Fixed by commit(s)	r316824 r318096

Extended Description

https://reviews.llvm.org/rL316824

[ConstantFold] Fix a crash when folding a GEP that has vector index

LLVM crashes when factoring out an out-of-bound index into preceding dimension and the preceding dimension uses vector index. Simply bail out now when this case happens.

[llvmbot]

assigned to @majnemer

[tstellar]

Hi David,

Is this OK for the release_50 branch?

[majnemer]

SGTM

[tstellar]

Merged: r318096