Merge r298604 into the 4.0 branch : [SDAG] Fix zeroExtend assertion error

[tstellar]

Bugzilla Link	32409
Resolution	FIXED
Resolved on	Apr 24, 2017 13:14
Version	4.0
OS	All
Blocks	#31409

Extended Description

Is this patch OK to merge to the 4.0 branch?

[tstellar]

assigned to @tstellar

[llvmbot]

llvm/llvm-bugzilla-archive#32284 was reopened because of similar cases. If we add this we should also consider: https://reviews.llvm.org/D31625

[bogner]

Change looks good, though it's a bit unfortunate the test is just a "don't crash" test that doesn't actually check anything.

[tstellar]

Merged: r300979

Nirav once D31625 is committed, can you create a separate merge request for that one?

[llvmbot]

Will do.