[flang-commits] [flang] [flang][Driver] Enable -Os and -Oz in flang (PR #164707)

[Tarun Prabhu via flang-commits]

tarunprabhu wrote:

- Several MLIR passes are now disabled if `-Os` or `-Oz` are provided. 
- The test of the MLIR pass pipeline has been completely overhauled to accommodate this. 
- The description of the PR has been updated to reflect these changes,

https://github.com/llvm/llvm-project/pull/164707