[X86] Add PR40483 test cases
Demonstrate failure to merge ISD::ADD(x,y)/X86ISD::ADD(x,y) + ISD::SUB(x,y)/X86ISD::SUB(x,y) equivalent ops llvm-svn: 354758
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Demonstrate failure to merge ISD::ADD(x,y)/X86ISD::ADD(x,y) + ISD::SUB(x,y)/X86ISD::SUB(x,y) equivalent ops llvm-svn: 354758