[compiler] No need to push literal index in VisitArrayLiteral.

src/crankshaft/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast-numbering.h"
@@ skipping 6056 matching lines @@
     Runtime::FunctionId function_id = Runtime::kCreateArrayLiteral;
     literal = Add<HCallRuntime>(Runtime::FunctionForId(function_id), 4);
 
     // Register to deopt if the boilerplate ElementsKind changes.
     top_info()->dependencies()->AssumeTransitionStable(site);
   }
 
   // The array is expected in the bailout environment during computation
   // of the property values and is the value of the entire expression.
   Push(literal);
-  // The literal index is on the stack, too.
-  Push(Add<HConstant>(expr->literal_index()));
 
   HInstruction* elements = NULL;
 
   for (int i = 0; i < length; i++) {
     Expression* subexpr = subexprs->at(i);
     if (subexpr->IsSpread()) {
       return Bailout(kSpread);
     }
 
     // If the subexpression is a literal or a simple materialized literal it
@@ skipping 21 matching lines @@
         break;
       }
       default:
         UNREACHABLE();
         break;
     }
 
     Add<HSimulate>(expr->GetIdForElement(i));
   }
 
-  Drop(1);  // array literal index
   return ast_context()->ReturnValue(Pop());
 }
 
 
 HCheckMaps* HOptimizedGraphBuilder::AddCheckMap(HValue* object,
                                                 Handle<Map> map) {
   BuildCheckHeapObject(object);
   return Add<HCheckMaps>(object, map);
 }
 
@@ skipping 7506 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8