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

src/debug/mips64/debug-mips64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 
 namespace v8 {
@@ skipping 92 matching lines @@
   // jumping to the target address intended by the caller and that was
   // overwritten by the address of DebugBreakXXX.
   ExternalReference after_break_target =
       ExternalReference::debug_after_break_target_address(masm->isolate());
   __ li(t9, Operand(after_break_target));
   __ ld(t9, MemOperand(t9));
   __ Jump(t9);
 }
 
 
-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());
-  __ li(at, Operand(restarter_frame_function_slot));
-  __ sw(zero_reg, MemOperand(at, 0));
-
   // We do not know our frame height, but set sp based on fp.
   __ Dsubu(sp, fp, Operand(kPointerSize));
 
   __ Pop(ra, fp, a1);  // Return address, Frame, Function.
 
+  ParameterCount dummy(0);
+  __ FloodFunctionIfStepping(a1, no_reg, dummy, dummy);
+
   // Load context from the function.
   __ ld(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
 
   // Clear new.target as a safety measure.
   __ LoadRoot(a3, Heap::kUndefinedValueRootIndex);
 
   // Get function code.
   __ ld(at, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
   __ ld(at, FieldMemOperand(at, SharedFunctionInfo::kCodeOffset));
   __ Daddu(t9, at, Operand(Code::kHeaderSize - kHeapObjectTag));
 
   // Re-run JSFunction, a1 is function, cp is context.
   __ Jump(t9);
 }
 
 
 const bool LiveEdit::kFrameDropperSupported = true;
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64