Add regression test for the deoptimizer immediately followed by gc bug....

src/extensions/gc-extension.cc

Index: src/extensions/gc-extension.cc
===================================================================
--- src/extensions/gc-extension.cc	(revision 6613)
+++ src/extensions/gc-extension.cc	(working copy)
@@ -40,8 +40,12 @@
 
 
 v8::Handle<v8::Value> GCExtension::GC(const v8::Arguments& args) {
+  bool compact = false;
   // All allocation spaces other than NEW_SPACE have the same effect.
-  Heap::CollectAllGarbage(false);
+  if (args.Length() >= 1 && args[0]->IsBoolean()) {
+    compact = args[0]->BooleanValue();
+  }
+  Heap::CollectAllGarbage(compact);
   return v8::Undefined();
 }