[llvm-branch-commits] [clang] release/21.x: [clang] Allow trivial pp-directives before C++ module directive (#153641) (PR #154077)

[Erich Keane via llvm-branch-commits]

erichkeane wrote:

> I don't think this really meets our requirements for a backport? It isn't really fixing a regression/etc, right? This is just a general bug-fix? Or am I missing something?

Ah, I see on the original that @ChuanqiXu9 said we need to do so?  I'd like to see the reasoning.

https://github.com/llvm/llvm-project/pull/154077