[Clang][AST] Store injected template arguments in TemplateParameterList (#113579) Currently, we store injected template arguments in `RedeclarableTemplateDecl::CommonBase`. This approach has a couple problems: 1. We can only access the injected template arguments of `RedeclarableTemplateDecl` derived types, but other `Decl` kinds still make use of the injected arguments (e.g. `ClassTemplatePartialSpecializationDecl`, `VarTemplatePartialSpecializationDecl`, and `TemplateTemplateParmDecl`). 2. Accessing the injected template arguments requires the common data structure to be allocated. This may occur before we determine whether a previous declaration exists (e.g. when comparing constraints), so if the template _is_ a redeclaration, we end up discarding the common data structure. This patch moves the storage and access of injected template arguments from `RedeclarableTemplateDecl` to `TemplateParameterList`.
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