[llvm] [SPIR-V] Fix DebugScope resolving DILexicalBlockFile to DebugCompilationUnit (PR #228259)

[Manuel Carrasco via llvm-commits]

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mgcarrasco wrote:

I think the comment is not accurate. There is a SPIR-V counterpart (DebugLexicalBlockDiscriminator) but that cannot be used as a scope. Same for the PR description.

https://github.com/llvm/llvm-project/pull/228259