Merging r339674:

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r339674 | aemerson | 2018-08-14 14:04:25 +0200 (Tue, 14 Aug 2018) | 3 lines

[GlobalISel][IRTranslator] Fix a bug in handling repeating struct types during argument lowering.

Differential Revision: https://reviews.llvm.org/D49442
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_70@340358 91177308-0d34-0410-b5e6-96231b3b80d8