Reapply "[Clang][Sema] Refactor collection of multi-level template argument lists (#106585, #111173)" (#111852) This patch reapplies #111173, fixing a bug when instantiating dependent expressions that name a member template that is later explicitly specialized for a class specialization that is implicitly instantiated. The bug is addressed by adding the `hasMemberSpecialization` function, which return `true` if _any_ redeclaration is a member specialization. This is then used when determining the instantiation pattern for a specialization of a template, and when collecting template arguments for a specialization of a template.
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