Reland and fix "Allow ICs to be generated for own global proxy."

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 1ecacd8d16d72e03366651def33d20ff31d94649..fcc6436e47748d636aba6eb46d20c679ffe8efb5 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2361,10 +2361,6 @@ class JSObject: public JSReceiver {
   // been modified since it was created.  May give false positives.
   bool IsDirty();
 
-  // If the receiver is a JSGlobalProxy this method will return its prototype,
-  // otherwise the result is the receiver itself.
-  inline Object* BypassGlobalProxy();
-
   // Accessors for hidden properties object.
   //
   // Hidden properties are not local properties of the object itself.