A few small refactorings and typo fixes

src/hydrogen-environment-liveness.cc

 // Copyright 2013 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 183 matching lines @@
     for (int block_id = block_count_ - 1; block_id >= 0; --block_id) {
       if (!worklist.Contains(block_id)) {
         continue;
       }
       worklist.Remove(block_id);
       last_simulate_ = NULL;
 
       HBasicBlock* block = graph()->blocks()->at(block_id);
       UpdateLivenessAtBlockEnd(block, &live);
 
-      for (HInstruction* instr = block->last(); instr != NULL;
+      for (HInstruction* instr = block->end(); instr != NULL;
            instr = instr->previous()) {
         UpdateLivenessAtInstruction(instr, &live);
       }
 
       // Reached the start of the block, do necessary bookkeeping:
       // store computed information for this block and add predecessors
       // to the work list as necessary.
       first_simulate_.Set(block_id, last_simulate_);
       first_simulate_invalid_for_index_[block_id]->CopyFrom(
           went_live_since_last_simulate_);
@@ skipping 20 matching lines @@
     ZapEnvironmentSlotsInSuccessors(block, &live);
   }
 
   // Finally, remove the HEnvironment{Bind,Lookup} markers.
   for (int i = 0; i < markers_.length(); ++i) {
     markers_[i]->DeleteAndReplaceWith(NULL);
   }
 }
 
 } }  // namespace v8::internal