[clang][modules-driver] Reject module definitions in non-module inputs (#193629) This changes the modules driver to only allow files of type `-x c++module` to define a module. This makes it easier to add support for `-fno-modules-reduced-bmi` later on and better follows Clang conventions. Addresses: https://github.com/llvm/llvm-project/pull/193312#discussion_r3122860347
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