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RFC https://discourse.llvm.org/t/rfc-dwarfdebug-fix-and-improve-handling-imported-entities-types-and-static-local-in-subprogram-and-lexical-block-scopes/68544 Similar to imported declarations, the patch tracks function-local types in DISubprogram's 'retainedNodes' field. DwarfDebug is adjusted in accordance with the aforementioned metadata change and provided a support of function-local types scoped within a lexical block. The patch assumes that DICompileUnit's 'enums field' no longer tracks local types and DwarfDebug would assert if any locally-scoped types get placed there. Reviewed By: jmmartinez Authored-by: Kristina Bessonova <kbessonova@accesssoftek.com> Differential Revision: https://reviews.llvm.org/D144006