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

src/debug/arm64/debug-arm64.cc

Index: src/debug/arm64/debug-arm64.cc
diff --git a/src/debug/arm64/debug-arm64.cc b/src/debug/arm64/debug-arm64.cc
index 50819bcfbd290db60a3255eaefd25793ff7652a4..c2b60a9326be95ec970d26b49cf3ff7d839d88e7 100644
--- a/src/debug/arm64/debug-arm64.cc
+++ b/src/debug/arm64/debug-arm64.cc
@@ -124,27 +124,19 @@ void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
 }
 
 
-void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
-  __ Ret();
-}
-
-
 void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
-  ExternalReference restarter_frame_function_slot =
-      ExternalReference::debug_restarter_frame_function_pointer_address(
-          masm->isolate());
-  UseScratchRegisterScope temps(masm);
-  Register scratch = temps.AcquireX();
-
-  __ Mov(scratch, restarter_frame_function_slot);
-  __ Str(xzr, MemOperand(scratch));
-
   // We do not know our frame height, but set sp based on fp.
   __ Sub(masm->StackPointer(), fp, kPointerSize);
   __ AssertStackConsistency();
 
   __ Pop(x1, fp, lr);  // Function, Frame, Return address.
 
+  ParameterCount dummy(0);
+  __ FloodFunctionIfStepping(x1, no_reg, dummy, dummy);
+
+  UseScratchRegisterScope temps(masm);
+  Register scratch = temps.AcquireX();
+
   // Load context from the function.
   __ Ldr(cp, FieldMemOperand(x1, JSFunction::kContextOffset));