Implement ES6 symbol registry and predefined symbols

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 916c99371938da6f63eea6eea42525cc1afd0c00..a6316680ce2491538e733d4d2067b019c47e7d87 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -636,6 +636,13 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_SymbolDescription) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_SymbolRegistry) {
+  HandleScope scope(isolate);

[Michael Starzinger, 2014/03/19 10:15:25]

nit: Not that it makes much of a difference, but this can be within a
SealHandleScope here.

[rossberg, 2014/03/20 10:40:13]

Done.

+  ASSERT(args.length() == 0);
+  return isolate->heap()->symbol_registry();
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_SymbolIsPrivate) {
   SealHandleScope shs(isolate);
   ASSERT(args.length() == 1);