Remove default from switch.

src/hydrogen.cc

 // Copyright 2012 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 919 matching lines @@
         if (block()->IsLoopHeader() && block() != loop_->loop_header()) {
           // In this case we need to perform a LOOP_MEMBERS cycle so we
           // initialize it and return this instead of father.
           return SetupLoopMembers(zone, block(),
                                   block()->loop_information(), loop_header_);
         } else {
           return father_;
         }
       case NONE:
         return father_;
-      default:
-        UNREACHABLE();
-        return NULL;
     }
+    UNREACHABLE();
+    return NULL;
   }
 
   // Walks up the stack.
   PostorderProcessor* Backtrack(Zone* zone,
                                 BitVector* visited,
                                 ZoneList<HBasicBlock*>* order) {
     PostorderProcessor* parent = Pop(zone, visited, order);
     while (parent != NULL) {
       PostorderProcessor* next =
           parent->PerformNonBacktrackingStep(zone, visited, order);
@@ skipping 8489 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal