[clang] [Clang] Fix handling of brace ellison when building deduction guides (PR #94889)

[Haojian Wu via cfe-commits]

================
@@ -335,3 +335,73 @@ namespace TTP {
 // CHECK-NEXT:      `-TemplateArgument type 'T':'type-parameter-0-0'{{$}}
 // CHECK-NEXT:        `-TemplateTypeParmType {{.+}} 'T' dependent depth 0 index 0{{$}}
 // CHECK-NEXT:          `-TemplateTypeParm {{.+}} 'T'{{$}}
+
+namespace GH64625 {
+
+template <class T> struct X {
----------------
hokein wrote:

Can you add a test with multiple array members? like

```
template <class T> struct X {
  T t1[2];
  T t2[3];
};

X x = {{1, 2}, {3, 4, 5}};
```

https://github.com/llvm/llvm-project/pull/94889