Merging r226711:

Merging r226711:
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r226711 | jroelofs | 2015-01-21 14:39:43 -0800 (Wed, 21 Jan 2015) | 8 lines

Fix load-store optimizer on thumbv4t

Thumbv4t does not have lo->lo copies other than MOVS,
and that can't be predicated. So emit MOVS when needed
and bail if there's a predicate.

http://reviews.llvm.org/D6592

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_36@226918 91177308-0d34-0410-b5e6-96231b3b80d8