ES6: Add Object.getOwnPropertySymbols

src/macros.py

Index: src/macros.py
diff --git a/src/macros.py b/src/macros.py
index 7bad23bd425369f9452fe33c90d86f31bdc14a49..0ba542739e6949c73f8a3064c1e0b975f3ce03d4 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -159,6 +159,7 @@ macro JSON_NUMBER_TO_STRING(arg) = ((%_IsSmi(%IS_VAR(arg)) || arg - arg == 0) ?
 
 # Private names.
 macro NEW_PRIVATE(name) = (%CreatePrivateSymbol(name));
+macro IS_PRIVATE(sym) = (%SymbolIsPrivate(sym));
 macro HAS_PRIVATE(obj, sym) = (sym in obj);
 macro GET_PRIVATE(obj, sym) = (obj[sym]);
 macro SET_PRIVATE(obj, sym, val) = (obj[sym] = val);
@@ -260,3 +261,9 @@ const COMPILATION_TYPE_JSON = 2;
 
 # Matches Messages::kNoLineNumberInfo from v8.h
 const kNoLineNumberInfo = 0;
+
+# Matches PropertyAttributes from property-details.h
+const PROPERTY_ATTRIBUTES_NONE = 0;
+const PROPERTY_ATTRIBUTES_STRING = 8;
+const PROPERTY_ATTRIBUTES_SYMBOLIC = 16;
+const PROPERTY_ATTRIBUTES_PRIVATE_SYMBOL = 32;