Debugger: use debug break slots to break at function exit.

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index e0dd1938c88c9fd27c8908493478cd806fea7d6e..9626628877aa8e6ab8126200958c910339a4d8a2 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -1506,7 +1506,7 @@ class CodePatcher {
   CodePatcher(byte* address,
               int instructions,
               FlushICache flush_cache = FLUSH);
-  virtual ~CodePatcher();
+  ~CodePatcher();
 
   // Macro assembler to emit code.
   MacroAssembler* masm() { return &masm_; }