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[X86FixupBWInsts] Fix miscompilation if sibling sub-register is live.

Authored by a.elovikov on Jan 29 2018, 1:26 AM.

Description

[X86FixupBWInsts] Fix miscompilation if sibling sub-register is live.

Summary: The issues was found during D40524.

Reviewers: andrew.w.kaylor, craig.topper, MatzeB

Reviewed By: andrew.w.kaylor

Subscribers: aivchenk, llvm-commits

Differential Revision: https://reviews.llvm.org/D42533

llvm-svn: 323635