Speedup global_proxy.* attributes/accessors (specialize GlobalProxy access).

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 7ae525f2542006b869e886cf8bb89b48bb917e27..4cef17fba77e51afceb6b5ab6baae8924ca37ec0 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -11152,6 +11152,8 @@ class FunctionTemplateInfo: public TemplateInfo {
   DECL_BOOLEAN_ACCESSORS(do_not_cache)
   DECL_BOOLEAN_ACCESSORS(accept_any_receiver)
 
+  DECL_ACCESSORS(cache_property, Object)
+
   DECLARE_CAST(FunctionTemplateInfo)
 
   // Dispatched behavior.
@@ -11178,7 +11180,8 @@ class FunctionTemplateInfo: public TemplateInfo {
       kAccessCheckInfoOffset + kPointerSize;
   static const int kFlagOffset = kSharedFunctionInfoOffset + kPointerSize;
   static const int kLengthOffset = kFlagOffset + kPointerSize;
-  static const int kSize = kLengthOffset + kPointerSize;
+  static const int kCachePropertyOffset = kLengthOffset + kPointerSize;
+  static const int kSize = kCachePropertyOffset + kPointerSize;
 
   static Handle<SharedFunctionInfo> GetOrCreateSharedFunctionInfo(
       Isolate* isolate, Handle<FunctionTemplateInfo> info);
@@ -11189,6 +11192,10 @@ class FunctionTemplateInfo: public TemplateInfo {
   bool IsTemplateFor(Map* map);
   inline bool instantiated();
 
+  // Helper function for cached accessors.
+  static MaybeHandle<Name> TryGetCachePropertyName(Isolate* isolate,
+                                                   Handle<Object> getter);
+
  private:
   // Bit position in the flag, from least significant bit position.
   static const int kHiddenPrototypeBit   = 0;