[6.0 🍒] Cache visible Clang modules for interface printing in 'ModuleDecl' #74336
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Instead of caching the collection of visible Clang modules in the 'TypePrinter', compute and cache them in the 'ModuleDecl'. When printing a textual interface, the compiler will instantiate many new instances of 'TypePrinter', which means caching them there is not useful.
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nkcsgexi
approved these changes
Jun 12, 2024
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Cherry-pick of #74307
Explanation: Instead of caching the collection of visible Clang modules in the 'TypePrinter', compute and cache them in the 'ModuleDecl'. When printing a textual interface, the compiler will instantiate many new instances of 'TypePrinter', which means caching them there is not useful.
Risk: Low. This change alters the textual interface printing logic to cache computed visible modules per-
ModuleDeclinstead of per-TypePrinter. The logic to compute visible modules is unchanged.Testing: This change does not affect any specific aspect of module emission, all existing tests in the test suite where a textual interface is emitted will exercise the new code-path.
Reviewed By: @tshortli