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33be83415c
This patch adds support for producing MLIR files when using -save-temps on flang. One MLIR file will be produced before lowering and optimization passes, containing the operations produced by the PFT-to-MLIR lowering bridge, and another at the end of the process, just before LLVM IR generation. This is accomplished by forwarding the -save-temps flag from the driver to the frontend, and modifying it to output MLIR files accordingly. Differential Revision: https://reviews.llvm.org/D146075