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

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 95a334a9a66a0215625cff256e5f2ed9505152f0..59965b18c6a4611fbaaae4b190bd67377e370ae1 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -6074,8 +6074,6 @@ void HOptimizedGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
   // 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;
 
@@ -6117,7 +6115,6 @@ void HOptimizedGraphBuilder::VisitArrayLiteral(ArrayLiteral* expr) {
     Add<HSimulate>(expr->GetIdForElement(i));
   }
 
-  Drop(1);  // array literal index
   return ast_context()->ReturnValue(Pop());
 }