Reland "Create internal fields on global proxy objects"

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 08e1e568a2fb3f1c689e44c57fb05b6e566f115c..9e3c0372ce2e34c091dcda0510015f217c09b823 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -8512,6 +8512,8 @@ class JSGlobalProxy : public JSObject {
   static const int kNativeContextOffset = JSObject::kHeaderSize;
   static const int kHashOffset = kNativeContextOffset + kPointerSize;
   static const int kSize = kHashOffset + kPointerSize;
+  static const int kSizeWithInternalFields =
+      kSize + v8::Context::kProxyInternalFieldCount * kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSGlobalProxy);