[clang] [llvm] [DebugInfo] Place local ODR-uniqued types in decl DISubprograms (PR #142166)

[Vladislav Dzhidzhoev via llvm-commits]

dzhidzhoev wrote:

> I think it sounds roughly plausible - the perf issue I wouldn't /expect/ to be a problem, there's probably a lot more types (in a full debug info build at least) than functions (hmm, well, actually hard to say - guess it could go either way) & I guess it's well enough optimized it hopefully won't show up in profiles or the like.

Let's try simpler solution https://github.com/llvm/llvm-project/pull/165032. If it works out, we won't need to support different llvm::Functions referring to the same DISubprogram in DwarfDebug. Uniquing DISubprograms may be a nice idea still.

https://github.com/llvm/llvm-project/pull/142166