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

src/debug/mips/debug-mips.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_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 
 namespace v8 {
@@ skipping 110 matching lines @@
   __ sw(zero_reg, MemOperand(at, 0));
 
   // We do not know our frame height, but set sp based on fp.
   __ Subu(sp, fp, Operand(kPointerSize));
 
   __ Pop(ra, fp, a1);  // Return address, Frame, Function.
 
   // Load context from the function.
   __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
 
+  // Clear new.target as a safety measure.
+  __ LoadRoot(a3, Heap::kUndefinedValueRootIndex);
+
   // Get function code.
   __ lw(at, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
   __ lw(at, FieldMemOperand(at, SharedFunctionInfo::kCodeOffset));
   __ Addu(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_MIPS