[clang] [clang] CTAD: fix the aggregate deduction guide for alias templates. (PR #90894)

[Erich Keane via cfe-commits]

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@@ -261,6 +261,13 @@ AG ag = {1};
 // CHECK:   | `-BuiltinType {{.*}} 'int'
 // CHECK:   `-ParmVarDecl {{.*}} 'int'
 
+template <typename X = int>
+using BG = G<int>;
+BG bg = {1.0};
+// CHECK-LABEL: Dumping <deduction guide for BG>
+// CHECK: FunctionTemplateDecl
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erichkeane wrote:

Could these be `CHECK-NEXT` ? 

https://github.com/llvm/llvm-project/pull/90894