[clang] [Clang][C++23] Implement P2448R2: Relaxing some constexpr restrictions (PR #77753)

[Vlad Serebrennikov via cfe-commits]

================
@@ -349,8 +349,8 @@ namespace dr1684 { // dr1684: 3.6
   };
   constexpr int f(NonLiteral &) { return 0; }
   constexpr int f(NonLiteral) { return 0; }
-  // since-cxx11-error@-1 {{constexpr function's 1st parameter type 
'NonLiteral' is not a literal type}}
-  //   since-cxx11-note@#dr1684-struct {{'NonLiteral' is not literal because 
it is not an aggregate and has no constexpr constructors other than copy or 
move constructors}}
+  // cxx11-20-error@-1 {{constexpr function with 1st non-literal parameter 
type 'NonLiteral' is a C++23 extension}}
+  // cxx11-20-note@#dr1684-struct {{'NonLiteral' is not literal because it is 
not an aggregate and has no constexpr constructors other than copy or move 
constructors}}
----------------
Endilll wrote:

```suggestion
  //   cxx11-20-note@#dr1684-struct {{'NonLiteral' is not literal because it is 
not an aggregate and has no constexpr constructors other than copy or move 
constructors}}
```

https://github.com/llvm/llvm-project/pull/77753
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