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

src/debug/x64/debug-x64.cc

Index: src/debug/x64/debug-x64.cc
diff --git a/src/debug/x64/debug-x64.cc b/src/debug/x64/debug-x64.cc
index 60f1cfd4cfd9b9c5e3a77218f34562f60760fe9f..0d56ea7521cbfbd1edf5e92b832e894753af9a0d 100644
--- a/src/debug/x64/debug-x64.cc
+++ b/src/debug/x64/debug-x64.cc
@@ -106,24 +106,16 @@ void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
 }
 
 
-void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
-  masm->ret(0);
-}
-
-
 void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
-  ExternalReference restarter_frame_function_slot =
-      ExternalReference::debug_restarter_frame_function_pointer_address(
-          masm->isolate());
-  __ Move(rax, restarter_frame_function_slot);
-  __ movp(Operand(rax, 0), Immediate(0));
-
   // We do not know our frame height, but set rsp based on rbp.
   __ leap(rsp, Operand(rbp, -1 * kPointerSize));
 
   __ Pop(rdi);  // Function.
   __ popq(rbp);
 
+  ParameterCount dummy(0);
+  __ FloodFunctionIfStepping(rdi, no_reg, dummy, dummy);
+
   // Load context from the function.
   __ movp(rsi, FieldOperand(rdi, JSFunction::kContextOffset));