[clang] [clang-tools-extra] [lldb] [llvm] [clang][modules] Serialize `CodeGenOptions` (PR #146422)

[Jan Svoboda via llvm-commits]

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+// This test checks that under implicit modules, different optimization levels
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jansvoboda11 wrote:

Thank you for letting me know, @paperchalice. My IDE does this in certain situations and I didn't notice before committing. Fixed in 96c27761.

https://github.com/llvm/llvm-project/pull/146422