X87: [builtins] Add support for NewTarget to Execution::New.

src/x87/frames-x87.h

Index: src/x87/frames-x87.h
diff --git a/src/x87/frames-x87.h b/src/x87/frames-x87.h
index c9e75e83ea60a4d06d9a9681a77e9da42efa3f0b..89e6ebda8cc31083cb0ea3167dba7682e2d5b794 100644
--- a/src/x87/frames-x87.h
+++ b/src/x87/frames-x87.h
@@ -39,6 +39,7 @@ class EntryFrameConstants : public AllStatic {
  public:
   static const int kCallerFPOffset      = -6 * kPointerSize;
 
+  static const int kNewTargetArgOffset = +2 * kPointerSize;
   static const int kFunctionArgOffset   = +3 * kPointerSize;
   static const int kReceiverArgOffset   = +4 * kPointerSize;
   static const int kArgcOffset          = +5 * kPointerSize;