[C++20] [Modules] Add signature to the BMI recording export imported modules After https://github.com/llvm/llvm-project/pull/86912, for the following example, ``` export module A; export import B; ``` The generated BMI of `A` won't change if the source location in `A` changes. Further, we plan avoid more such changes. However, it is slightly problematic since `export import` should propagate all the changes. So this patch adds a signature to the BMI of C++20 modules so that we can propagate the changes correctly.
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