Chuanqi Xu 3504937dfb [C++20] [Modules] Don't create multiple global module fragment
Since the serialization code would recognize modules by names and the
name of all global module fragment is <global>, so that the
serialization code would complain for the same module.

This patch fixes this by using a unique global module fragment in Sema.
Before this patch, the compiler would fail on an assertion complaining
the duplicated modules.

Reviewed By: urnathan, rsmith

Differential Revision: https://reviews.llvm.org/D115610
2022-02-08 11:52:09 +08:00
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