[DAGCombiner] Change foldAndOrOfSETCC() to optimize and/or patterns

CMP(A,C)||CMP(B,C) => CMP(MIN/MAX(A,B), C)
CMP(A,C)&&CMP(B,C) => CMP(MIN/MAX(A,B), C)

This first patch handles integer types.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D153502