[clang] [clang][AST] Invalidate DecompositionDecl if it has invalid initializer. (PR #72428)

[via cfe-commits]

================
@@ -24,4 +24,17 @@ void test() {
   auto b4 = A(1);
   // CHECK: `-VarDecl {{.*}} invalid b5 'auto'
   auto b5 = A{1};
-}
\ No newline at end of file
+}
+
+void pr72198() {
+  // CHECK: DecompositionDecl {{.*}} invalid 'int'
+  int [_, b] = {0, 0};
+  [b]{};
+}
+
+int get_point();
+void pr67495() {
+  // CHECK: DecompositionDecl {{.*}} invalid 'int &'
+  auto& [x, y] = get_point();
+  [x, y] {};
+}
----------------
cor3ntin wrote:

```suggestion
namespace GH67495 {
int get_point();
void f() {
  // CHECK: DecompositionDecl {{.*}} invalid 'int &'
  auto& [x, y] = get_point();
  [x, y] {};
}
}
```

https://github.com/llvm/llvm-project/pull/72428