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

src/debug/arm/debug-arm.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_ARM
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 
 namespace v8 {
@@ skipping 95 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());
   __ mov(ip, Operand(after_break_target));
   __ ldr(ip, MemOperand(ip));
   __ Jump(ip);
 }
 
 
-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());
-  __ mov(ip, Operand(restarter_frame_function_slot));
-  __ mov(r1, Operand::Zero());
-  __ str(r1, MemOperand(ip, 0));
-
   // Load the function pointer off of our current stack frame.
   __ ldr(r1, MemOperand(fp,
          StandardFrameConstants::kConstantPoolOffset - kPointerSize));
 
   // Pop return address, frame and constant pool pointer (if
   // FLAG_enable_embedded_constant_pool).
   __ LeaveFrame(StackFrame::INTERNAL);
 
+  ParameterCount dummy(0);
+  __ FloodFunctionIfStepping(r1, no_reg, dummy, dummy);
+
   { ConstantPoolUnavailableScope constant_pool_unavailable(masm);
     // Load context from the function.
     __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
 
     // Clear new.target as a safety measure.
     __ LoadRoot(r3, Heap::kUndefinedValueRootIndex);
 
     // Get function code.
     __ ldr(ip, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
     __ ldr(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset));
     __ add(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
 
     // Re-run JSFunction, r1 is function, cp is context.
     __ Jump(ip);
   }
 }
 
 
 const bool LiveEdit::kFrameDropperSupported = true;
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM