Merging r311599:
Merging r311599:

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r311599 | gberry | 2017-08-23 14:11:28 -0700 (Wed, 23 Aug 2017) | 4 lines

[AArch64][Falkor] Fix bug in Falkor HWPF tag collision avoidance

LDPDi was incorrectly marked as ignoring the destination register in the
prefetcher tag.
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git-svn-id: ee41f7a47e00113e4a3f1d4cbf84f6e482c3caa7@314553 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm