Merging r323816:

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r323816 | evandro | 2018-01-30 13:14:11 -0800 (Tue, 30 Jan 2018) | 5 lines

[AArch64] Expand testing of zero cycle zeroing

Make sure that r321824 doesn't change zeroing.

Differential revision: https://reviews.llvm.org/D42089
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llvm-svn: 332651