[clang] Revert "Reapply "[Clang][Sema] Refactor collection of multi-level template argument lists (#106585, #111173)" (#111852)" (PR #115159)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

@sdkrystian Friendly ping. Any chance for you to reapply this patch recently? 
thanks

https://github.com/llvm/llvm-project/pull/115159
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