[Clang][Sema] Earlier type checking for builtin unary operators (#90500) Currently, clang postpones all semantic analysis of unary operators with operands of pointer/pointer to member/array/function type until instantiation whenever that type is dependent (e.g. `T*` where `T` is a type template parameter). Consequently, the uninstantiated AST nodes all have the type `ASTContext::DependentTy` (which, for the purposes of #90152, is undesirable as that type may be the current instantiation! (e.g. `*this`)) This patch moves the point at which we perform semantic analysis for such expression to be prior to instantiation.
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