[clang] [Modules] Fix an identifier hiding a function-like macro definition. (PR #135471)

[Volodymyr Sapsai via cfe-commits]

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vsapsai wrote:

By the way, looked at the other tests in Modules directory and think that the test should start with "macro-" for consistency. Probably something like "macro-identifier-hiding.c" as we have "macro-hiding.cpp" already.

https://github.com/llvm/llvm-project/pull/135471