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Rollup merge of #137643 - beetrees:repr128-dwarf-variant-test, r=jieyouxu
Add DWARF test case for non-C-like `repr128` enums
LLVM 20 fixes DWARF debuginfo for non-C-like 128-bit enums: this PR adds a test case to the `repr128-dwarf` test to ensure that LLVM doesn't regress in the future.
Tracking issue: #56071
