Fangrui Song ad60802a71 [Verifier] Allow DW_TAG_class_type/DW_TAG_union_type to have no filename ...

`clang/lib/CodeGen/CGOpenMPRuntime.cpp` synthesized union
(`distinct !DICompositeType(tag: DW_TAG_union_type, name: "kmp_cmplrdata_t", size: 64, elements: <0x62b690>)`)
does not have meaningful filename/line number.

D94735 dropped the previously arbitrary and untested filename/line from the union and caused a verifier error here.

This fixes `check-libarcher` failures.

Differential Revision: https://reviews.llvm.org/D96212

2021-02-08 13:31:05 -08:00

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