Merging r266438:

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r266438 | niravd | 2016-04-15 08:01:38 -0700 (Fri, 15 Apr 2016) | 15 lines

Fix typing on generated LXV2DX/STXV2DX instructions

[PPC] Previously when casting generic loads to LXV2DX/ST instructions we
would leave the original load return type in place allowing for an
assertion failure when we merge two equivalent LXV2DX nodes with
different types.

This fixes PR27350.

Reviewers: nemanjai

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D19133

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llvm-svn: 271217