[flang][tco] Add more flags for generating codegen tests (#148171) Built on top of https://github.com/llvm/llvm-project/pull/146533 Adding some more options I use to generate minimal testcases for MLIR->LLVMIR conversion. Hopefully this will save us all some time when writing these tests. The following options are added - `-simplify-mlir` runs CSE and canonicalization at the end of the MLIR pipeline - `-enable-aa` allows toggling whether TBAA is enabled - `-test-gen` is shorthand for `-emit-final-mlir -simplify-mlir -enable-aa=false`
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