[test] Make sure plugin actually runs in clear-ast-before-backend-plugins.c

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D112253

Author: aeubanks

clang/test/Misc/clear-ast-before-backend-plugins.c

@@ -5,5 +5,6 @@
 
 // RUN: %clang_cc1 -mllvm -debug-only=codegenaction -clear-ast-before-backend -emit-obj -o /dev/null -load %llvmshlibdir/PrintFunctionNames%pluginext -add-plugin print-fns -plugin-arg-print-fns help %s 2>&1 | FileCheck %s --check-prefix=NO
 // NO-NOT: Clearing AST
+// NO: top-level-decl: "f"
 
 void f() {}