[x86] fix predicate for avoiding vblendv
It only makes sense to produce the logic ops when 1 of the constants is +0.0. Otherwise, go with vblendv to reduce code. llvm-svn: 347403
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It only makes sense to produce the logic ops when 1 of the constants is +0.0. Otherwise, go with vblendv to reduce code. llvm-svn: 347403