[TEST - DONT REVIEW]#70318

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ian-twilightcoder wants to merge 1 commit intoswiftlang:mainfrom

ian-twilightcoder:builtin-flag-2

Commits on Dec 8, 2023

[ClangImporter] Swift needs to pass `-Xclang -fbuiltin-headers-in-system-modules` for its module maps that group cstd headers
ian-twilightcoder
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