Do not push a redundant value context in crankshaft.

src/hydrogen.cc

 // Copyright 2011 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 5054 matching lines @@
 
     // Translate right subexpression by visiting it in the same AST
     // context as the entire expression.
     if (eval_right->HasPredecessor()) {
       eval_right->SetJoinId(expr->RightId());
       set_current_block(eval_right);
       Visit(expr->right());
     }
 
   } else if (ast_context()->IsValue()) {
-    CHECK_ALIVE(VisitForValue(expr->left()));
+    CHECK_ALIVE(Visit(expr->left()));
     ASSERT(current_block() != NULL);
 
     // We need an extra block to maintain edge-split form.
     HBasicBlock* empty_block = graph()->CreateBasicBlock();
     HBasicBlock* eval_right = graph()->CreateBasicBlock();
     HTest* test = is_logical_and
       ? new(zone()) HTest(Top(), eval_right, empty_block)
       : new(zone()) HTest(Top(), empty_block, eval_right);
     current_block()->Finish(test);
 
     set_current_block(eval_right);
     Drop(1);  // Value of the left subexpression.
-    CHECK_BAILOUT(VisitForValue(expr->right()));
+    CHECK_BAILOUT(Visit(expr->right()));
 
     HBasicBlock* join_block =
       CreateJoin(empty_block, current_block(), expr->id());
     set_current_block(join_block);
     ast_context()->ReturnValue(Pop());
 
   } else {
     ASSERT(ast_context()->IsEffect());
     // In an effect context, we don't need the value of the left subexpression,
     // only its control flow and side effects.  We need an extra block to
@@ skipping 1131 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify();
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal