[clang] [clang] Allow trivial pp-directives before C++ module directive (PR #153641)

[via cfe-commits]

llvmbot wrote:

<!--IGNORE-->
>/cherry-pick e6e874ce8f055f5b8c5d7f8c7fb0afe764d1d350

Error: Command failed due to missing milestone.

https://github.com/llvm/llvm-project/pull/153641
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