Move the default return handling to please some versions of gcc....

src/runtime.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 6318 matching lines @@
         return MaterializeLocalScope(frame_);
         break;
       case ScopeIterator::ScopeTypeWith:
         // Return the with object.
         return Handle<JSObject>(CurrentContext()->extension());
         break;
       case ScopeIterator::ScopeTypeClosure:
         // Materialize the content of the closure scope into a JSObject.
         return MaterializeClosure(CurrentContext());
         break;
-      default:
-        UNREACHABLE();
-        return Handle<JSObject>();
     }
+    UNREACHABLE();
+    return Handle<JSObject>();
   }
 
   // Return the context for this scope. For the local context there might not
   // be an actual context.
   Handle<Context> CurrentContext() {
     if (at_local_ && context_->closure() != *function_) {
       return Handle<Context>();
     }
     return context_;
   }
@@ skipping 1121 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage();
   }
 }
 
 
 } }  // namespace v8::internal