Revert of [debugger] do not predict step in target for liveedit.

src/debug/debug.h

Index: src/debug/debug.h
diff --git a/src/debug/debug.h b/src/debug/debug.h
index 3d2bbc22589c04745ec09612e3e32385d3c39d67..ab870f099092e29a5e29850479b8637e47154bb0 100644
--- a/src/debug/debug.h
+++ b/src/debug/debug.h
@@ -464,7 +464,8 @@
 
   // Support for LiveEdit
   void FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
-                             LiveEdit::FrameDropMode mode);
+                             LiveEdit::FrameDropMode mode,
+                             Object** restarter_frame_function_pointer);
 
   // Threading support.
   char* ArchiveDebug(char* to);
@@ -509,6 +510,11 @@
 
   Address after_break_target_address() {
     return reinterpret_cast<Address>(&after_break_target_);
+  }
+
+  Address restarter_frame_function_pointer_address() {
+    Object*** address = &thread_local_.restarter_frame_function_pointer_;
+    return reinterpret_cast<Address>(address);
   }
 
   Address step_in_enabled_address() {
@@ -659,6 +665,11 @@
     // Stores the way how LiveEdit has patched the stack. It is used when
     // debugger returns control back to user script.
     LiveEdit::FrameDropMode frame_drop_mode_;
+
+    // When restarter frame is on stack, stores the address
+    // of the pointer to function being restarted. Otherwise (most of the time)
+    // stores NULL. This pointer is used with 'step in' implementation.
+    Object** restarter_frame_function_pointer_;
   };
 
   // Storage location for registers when handling debug break calls
@@ -755,6 +766,8 @@
   static void GenerateDebugBreakStub(MacroAssembler* masm,
                                      DebugBreakCallHelperMode mode);
 
+  static void GeneratePlainReturnLiveEdit(MacroAssembler* masm);
+
   // FrameDropper is a code replacement for a JavaScript frame with possibly
   // several frames above.
   // There is no calling conventions here, because it never actually gets