Duplicate metadata

```llvm
!13 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!14 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!15 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !12, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!16 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!17 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!18 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !12, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!19 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!20 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !12, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!21 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!22 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!23 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!24 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!25 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!26 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!27 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!28 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!29 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!30 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!31 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!32 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!33 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!34 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!35 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !8, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
!36 = distinct !DICompileUnit(language: DW_LANG_Julia, file: !12, producer: "julia", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !4, nameTableKind: None)
```

No file, test, or entry point is named. Start by reproducing the LLVM debug metadata shown in the issue and trace where Julia GPU compilation creates DICompileUnit entries. Done means equivalent compile units are not emitted redundantly, with coverage for the affected compilation path.

Written by the indexing model from the issue text.