[InstSimplify] add tests for fadd/fsub; NFC
Instcombine gets some, but not all, of these cases via it's internal reassociation transforms. It fails in all cases with vector types. llvm-svn: 339168
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Instcombine gets some, but not all, of these cases via it's internal reassociation transforms. It fails in all cases with vector types. llvm-svn: 339168