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

[Krystian Stasiowski via cfe-commits]

================
@@ -4159,7 +4159,7 @@ FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() 
const {
   if (FunctionTemplateSpecializationInfo *Info
         = TemplateOrSpecialization
             .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
-    return Info->getTemplate();
+    return Info->getTemplate()->getMostRecentDecl();
----------------
sdkrystian wrote:

@mizvekov I reverted the change where `getPrimaryTemplate` returns the most 
recent declaration & changed `getTemplateInstantiationPattern` to use the most 
recent declaration of the primary template instead in 
d312bd464bae21d127f468075cb78178f782ca9a.

https://github.com/llvm/llvm-project/pull/111173
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