Sanjay Patel d72a458d28 [InstCombine] insert a new shuffle in a safe place (PR25999) ...

Limit this transform to a basic block and guard against PHIs.
Hopefully, this fixes the remaining failures in PR25999:
https://llvm.org/bugs/show_bug.cgi?id=25999

llvm-svn: 257133

2016-01-08 01:39:16 +00:00

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