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[X86][X86 intrinsics]Folding cmp(sub(a,b),0) into cmp(a,b) optimization

Description

[X86][X86 intrinsics]Folding cmp(sub(a,b),0) into cmp(a,b) optimization

This patch adds new optimization (Folding cmp(sub(a,b),0) into cmp(a,b))
to instCombineCall pass and was written specific for X86 CMP intrinsics.

Differential Revision: https://reviews.llvm.org/D31398