[clang] Reapply "[Clang][Sema] Refactor collection of multi-level template argument lists (#106585, #111173)" (PR #111852)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@mstorsjo Tested this patch with QT and it builds without issue.

https://github.com/llvm/llvm-project/pull/111852
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