Christian Ulmann d9391a37a9 [mlir][llvm] Stop exporting empty debug MD strings ...

This commit ensures that no empty debug metadata strings are exported as
these are not legal names. Additionally, this commit ensures that
non-existing strings are not accidentially imported as empty strings.

Reviewed By: gysit

Differential Revision: https://reviews.llvm.org/D144263

2023-02-27 09:49:57 +01:00

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