Reland of [debugger] do not restart frames that reference new.target for liveedit.

src/debug/x64/debug-x64.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_X64
 
 #include "src/assembler.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 
@@ skipping 109 matching lines @@
 
   // We do not know our frame height, but set rsp based on rbp.
   __ leap(rsp, Operand(rbp, -1 * kPointerSize));
 
   __ Pop(rdi);  // Function.
   __ popq(rbp);
 
   // Load context from the function.
   __ movp(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
+  // Clear new.target as a safety measure.
+  __ LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
+
   // Get function code.
-  __ movp(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
-  __ movp(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset));
-  __ leap(rdx, FieldOperand(rdx, Code::kHeaderSize));
+  __ movp(rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ movp(rbx, FieldOperand(rbx, SharedFunctionInfo::kCodeOffset));
+  __ leap(rbx, FieldOperand(rbx, Code::kHeaderSize));
 
   // Re-run JSFunction, rdi is function, rsi is context.
-  __ jmp(rdx);
+  __ jmp(rbx);
 }
 
 const bool LiveEdit::kFrameDropperSupported = true;
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64