[clang] [clang][modules] Print library module manifest path. (PR #76451)

[Mark de Wever via cfe-commits]

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+// Test that -print-library-module-manifest-path finds the correct file.
+
+// RUN: %clang -print-library-module-manifest-path \
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mordante wrote:

They work with one or two dashes, `Flag<["-", "--"]`, in `Options.td` does that. This option does the same.

https://github.com/llvm/llvm-project/pull/76451