[clang] [C++][Modules] A module directive may only appear as the first preprocessing tokens in a file (PR #144233)

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yronglin wrote:

> > 1. IIUC, `42935M | 43035M (+0.23%)`does this mean the compiler output binary size increased by 0.23%?
> 
> This is the number of instructions retired. It's a metric for compilation time, not binary size.

Thanks, I reproduced this issue, and created an new PR to fix issue https://github.com/llvm/llvm-project/pull/145244.

https://github.com/llvm/llvm-project/pull/144233