x64: make one entry point for binary ops

* rename `genBinMathOp` into `genBinOp` and handle commutativity
* rename `genBinMathOpMir` into `genBinOpMir`
20e7f1218bJakub Konka committed on 5/9/2022, 8:31:36 PMparent9c3d24e
1 file changedLine totals unavailable