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

src/full-codegen/x64/full-codegen-x64.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
@@ skipping 1697 matching lines @@
   for (; array_index < length; array_index++) {
     Expression* subexpr = subexprs->at(array_index);
     if (subexpr->IsSpread()) break;
 
     // If the subexpression is a literal or a simple materialized literal it
     // is already set in the cloned array.
     if (CompileTimeValue::IsCompileTimeValue(subexpr)) continue;
 
     if (!result_saved) {
       __ Push(rax);  // array literal
-      __ Push(Smi::FromInt(expr->literal_index()));
       result_saved = true;
     }
     VisitForAccumulatorValue(subexpr);
 
     __ Move(StoreDescriptor::NameRegister(), Smi::FromInt(array_index));
-    __ movp(StoreDescriptor::ReceiverRegister(), Operand(rsp, kPointerSize));
+    __ movp(StoreDescriptor::ReceiverRegister(), Operand(rsp, 0));
     EmitLoadStoreICSlot(expr->LiteralFeedbackSlot());
     Handle<Code> ic =
         CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
     CallIC(ic);
 
     PrepareForBailoutForId(expr->GetIdForElement(array_index), NO_REGISTERS);
   }
 
   // In case the array literal contains spread expressions it has two parts. The
   // first part is  the "static" array which has a literal index is  handled
   // above. The second part is the part after the first spread expression
   // (inclusive) and these elements gets appended to the array. Note that the
   // number elements an iterable produces is unknown ahead of time.
   if (array_index < length && result_saved) {
-    __ Drop(1);  // literal index
     __ Pop(rax);
     result_saved = false;
   }
   for (; array_index < length; array_index++) {
     Expression* subexpr = subexprs->at(array_index);
 
     __ Push(rax);
     if (subexpr->IsSpread()) {
       VisitForStackValue(subexpr->AsSpread()->expression());
       __ InvokeBuiltin(Context::CONCAT_ITERABLE_TO_ARRAY_BUILTIN_INDEX,
                        CALL_FUNCTION);
     } else {
       VisitForStackValue(subexpr);
       __ CallRuntime(Runtime::kAppendElement, 2);
     }
 
     PrepareForBailoutForId(expr->GetIdForElement(array_index), NO_REGISTERS);
   }
 
   if (result_saved) {
-    __ Drop(1);  // literal index
     context()->PlugTOS();
   } else {
     context()->Plug(rax);
   }
 }
 
 
 void FullCodeGenerator::VisitAssignment(Assignment* expr) {
   DCHECK(expr->target()->IsValidReferenceExpressionOrThis());
 
@@ skipping 3163 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64