[clang] [C++20] [Modules] Offer -fmodules-embed-all-files option (PR #107194)

[Chuanqi Xu via cfe-commits]

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+// RUN: %clang -std=c++20 %s -fmodules-embed-all-files -### 2>&1 | FileCheck %s
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ChuanqiXu9 wrote:

Done

https://github.com/llvm/llvm-project/pull/107194