[CIR][MLIR][Lowering] Op `cir.select` is lowered to `arith.select`.#2033

bcardosolopes merged 2 commits intollvm:mainllvm/clangir:mainfrom

Terapines:cir-to-mlir-select-opTerapines/clangir:cir-to-mlir-select-opCopy head branch name to clipboard