ES6 symbols: enable symbols as weak map keys

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index bd18302e1a3a5539ea18ffb92ee28f31294c3157..c2277f74f5009340de93bc95aa51313343229711 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -899,7 +899,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapGet) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSWeakMap, weakmap, 0);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, key, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
   Handle<ObjectHashTable> table(ObjectHashTable::cast(weakmap->table()));
   Handle<Object> lookup(table->Lookup(*key), isolate);
   return lookup->IsTheHole() ? isolate->heap()->undefined_value() : *lookup;
@@ -910,7 +910,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapHas) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSWeakMap, weakmap, 0);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, key, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
   Handle<ObjectHashTable> table(ObjectHashTable::cast(weakmap->table()));
   Handle<Object> lookup(table->Lookup(*key), isolate);
   return isolate->heap()->ToBoolean(!lookup->IsTheHole());
@@ -921,7 +921,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapDelete) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSWeakMap, weakmap, 0);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, key, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
   Handle<ObjectHashTable> table(ObjectHashTable::cast(weakmap->table()));
   Handle<Object> lookup(table->Lookup(*key), isolate);
   Handle<ObjectHashTable> new_table =
@@ -935,7 +935,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapSet) {
   HandleScope scope(isolate);
   ASSERT(args.length() == 3);
   CONVERT_ARG_HANDLE_CHECKED(JSWeakMap, weakmap, 0);
-  CONVERT_ARG_HANDLE_CHECKED(JSReceiver, key, 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
   Handle<Object> value(args[2], isolate);
   Handle<ObjectHashTable> table(ObjectHashTable::cast(weakmap->table()));
   Handle<ObjectHashTable> new_table = PutIntoObjectHashTable(table, key, value);