[clang] [Preprocessor] Do not expand macros if the input is already preprocessed (PR #137665)

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Juan Manuel Martinez =?utf-8?q?Caamaño?= <juamarti at amd.com>,
Juan Manuel Martinez =?utf-8?q?Caamaño?= <juamarti at amd.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/137665 at github.com>


cor3ntin wrote:

This seems reasonable. Can you update the description to explain the motivation for the change, though?
Is it a bug you are trying to fix, or a specific scenario you think should be optimized? Thanks

https://github.com/llvm/llvm-project/pull/137665