[liveedit] fix stepping after replacing bytecode.

src/runtime/runtime-debug.cc

 // Copyright 2014 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.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
 #include "src/debug/debug-scopes.h"
@@ skipping 24 matching lines @@
 RUNTIME_FUNCTION(Runtime_DebugBreakOnBytecode) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
   isolate->debug()->set_return_value(value);
 
   // Get the top-most JavaScript frame.
   JavaScriptFrameIterator it(isolate);
   isolate->debug()->Break(it.frame());
 
+  // If live-edit has dropped frames, we are not going back to dispatch.
+  if (LiveEdit::SetAfterBreakTarget(isolate->debug())) return Smi::FromInt(0);
+
   // Return the handler from the original bytecode array.
   DCHECK(it.frame()->is_interpreted());
   InterpretedFrame* interpreted_frame =
       reinterpret_cast<InterpretedFrame*>(it.frame());
   SharedFunctionInfo* shared = interpreted_frame->function()->shared();
   BytecodeArray* bytecode_array = shared->bytecode_array();
   int bytecode_offset = interpreted_frame->GetBytecodeOffset();
   interpreter::Bytecode bytecode =
       interpreter::Bytecodes::FromByte(bytecode_array->get(bytecode_offset));
   return isolate->interpreter()->GetBytecodeHandler(
@@ skipping 1490 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8