[NVVM][MLIR] Refactor conversion of Math / Arith Operations seperate Passes (#180058)
This Commit refactors the conversion of Math / Arith operations to NVVM
into a separate Pass called MathToNVVM. This was done to allow to
support the lowering of Math / Arith operations in flang. This mirrors
what was done in MathToROCDL.
This is PR (1/2) to address
https://github.com/llvm/llvm-project/issues/147023 and
https://github.com/llvm/llvm-project/issues/179347.
PR(2/2) that adds this pass to flang is here:
https://github.com/llvm/llvm-project/pull/180060