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[X86] When applying the shuffle-to-zero-extend transformation on floating point…

Authored by aymanmus on Sep 14 2017, 5:06 AM.

Description

[X86] When applying the shuffle-to-zero-extend transformation on floating point, bitcast to integer first.

Fix issue described in PR34577.

Differential Revision: https://reviews.llvm.org/D37803

llvm-svn: 313256