[flang] Add -O flag to tco (#151869) At the moment, there is no established way to emit LLVM IR before optimization in LLVM. tco can partially does, but the optimization level is fixed to 2. This patch adds -O flag to tco. Note that this is not completely equivalent to the frontend option. tco does not accept -O flag without numbers, and the default optimization level is not 0 but 2.
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