X87: Debugger: use debug break slots to break at function exit.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index 24f6f308c0f5408a2cc9ca25951b8ccb9b4a92ea..71d538746793210a138a885bdc4c18b7d4331844 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -979,7 +979,7 @@ class MacroAssembler: public Assembler {
 class CodePatcher {
  public:
   CodePatcher(byte* address, int size);
-  virtual ~CodePatcher();
+  ~CodePatcher();
 
   // Macro assembler to emit code.
   MacroAssembler* masm() { return &masm_; }