[clang] [clang] Implement P2582R1: CTAD from inherited constructors (PR #98788)

[Haojian Wu via cfe-commits]

================
@@ -0,0 +1,260 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++23 -verify %s
+
+namespace test1 {
+  template<typename T> struct Base {
+    template<typename V = T> requires true
+    Base(T);
+  };
+
+  template<typename T> struct InheritsCtors : public Base<T> {
+    using Base<T>::Base;
+  };
+
+  InheritsCtors inheritsCtors(1);
+  using IC = InheritsCtors<int>;
+  using IC = decltype(inheritsCtors);
----------------
hokein wrote:

nit: use `static_assert(__is_same(...));` to verify the type, the same below.

https://github.com/llvm/llvm-project/pull/98788