generalize the test

Author: cor3ntin

clang/test/AST/ast-dump-pack-indexing-crash.cpp

@@ -15,10 +15,11 @@ void not_pack() {
 
 // CHECK:      -FunctionDecl {{.*}} not_pack 'void ()'
 // CHECK:           |-DeclStmt {{.*}}
-// CHECK:           | `-VarDecl {{.*}} a 'NotAPack...{{.*}}'
 // CHECK:           |-DeclStmt {{.*}}
-// CHECK:           | `-VarDecl {{.*}} 'T...{{.*}}'
-// CHECK:           `-DeclStmt {{.*}}
-// CHECK:             `-VarDecl {{.*}} c 'Tp...{{.*}}'
+// CHECK-NEXT:      | `-VarDecl {{.*}} a 'NotAPack...{{.*}}'
+// CHECK-NEXT:      |-DeclStmt {{.*}}
+// CHECK-NEXT:      | `-VarDecl {{.*}} 'T...{{.*}}'
+// CHECK-NEXT:      `-DeclStmt {{.*}}
+// CHECK-NEXT:        `-VarDecl {{.*}} c 'Tp...{{.*}}'
 
 }