Revert of [debugger] flood function for stepping before calling it.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index ba77a458b06261088427827d13e5edf42b5b229e..5434065314d9277df6d7fca33971269330fe2c20 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -1000,7 +1000,7 @@
   Address address() const { return reinterpret_cast<Address>(address_); }
 
   // Used to check if single stepping is enabled in generated code.
-  static ExternalReference debug_last_step_action_address(Isolate* isolate);
+  static ExternalReference debug_step_in_fp_address(Isolate* isolate);
 
 #ifndef V8_INTERPRETED_REGEXP
   // C functions called from RegExp generated code.
@@ -1150,10 +1150,7 @@
   virtual void BeforeCall(int call_size) const = 0;
   // Called just after emitting a call, i.e., at the return site for the call.
   virtual void AfterCall() const = 0;
-  // Return whether call needs to check for debug stepping.
-  virtual bool NeedsDebugStepCheck() const { return false; }
-};
-
+};
 
 class NullCallWrapper : public CallWrapper {
  public:
@@ -1161,16 +1158,6 @@
   virtual ~NullCallWrapper() { }
   virtual void BeforeCall(int call_size) const { }
   virtual void AfterCall() const { }
-};
-
-
-class CheckDebugStepCallWrapper : public CallWrapper {
- public:
-  CheckDebugStepCallWrapper() {}
-  virtual ~CheckDebugStepCallWrapper() {}
-  virtual void BeforeCall(int call_size) const {}
-  virtual void AfterCall() const {}
-  virtual bool NeedsDebugStepCheck() const { return true; }
 };