[llvm] [llvm][DebugInfo] Unwrap template parameters that are typedefs when reconstructing DIE names (PR #168734)

[David Blaikie via llvm-commits]

dwblaikie wrote:

Hmm, probably for good reason, but: Why do it this way (having the canonical type printing ignore the preferred name), rather than the other way (fully embrace the preferred name, and use it when printing the DW_AT_name (when unsimplified or mangled)?)

https://github.com/llvm/llvm-project/pull/168734