Use CollectAllGarbage for the gc() extension.

Review URL: http://codereview.chromium.org/5666

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1771 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/execution.cc

@@ -636,7 +636,7 @@ v8::Handle<v8::FunctionTemplate> GCExtension::GetNativeFunction(
 
 v8::Handle<v8::Value> GCExtension::GC(const v8::Arguments& args) {
   // All allocation spaces other than NEW_SPACE have the same effect.
-  Heap::CollectGarbage(0, OLD_DATA_SPACE);
+  Heap::CollectAllGarbage();
   return v8::Undefined();
 }