llvm-project

4554cdf6 - [modules] Fix assert on Clang module import from the global module fragment. (#159771)

[modules] Fix assert on Clang module import from the global module fragment. (#159771) Fixes #159768. When building a named module interface with `-fmodules` enabled, importing a Clang module from inside the global module fragment causes Clang to crash only on assertion builds. This fixes the assert and extends the test coverage.