Introduce {ConstantElementsPair} struct for type safety.

src/interpreter/bytecode-array-builder.cc

 // Copyright 2015 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/interpreter/bytecode-array-builder.h"
 
 #include "src/globals.h"
 #include "src/interpreter/bytecode-array-writer.h"
 #include "src/interpreter/bytecode-dead-code-optimizer.h"
 #include "src/interpreter/bytecode-label.h"
@@ skipping 620 matching lines @@
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::CreateRegExpLiteral(
     Handle<String> pattern, int literal_index, int flags) {
   size_t pattern_entry = GetConstantPoolEntry(pattern);
   OutputCreateRegExpLiteral(pattern_entry, literal_index, flags);
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::CreateArrayLiteral(
-    Handle<FixedArray> constant_elements, int literal_index, int flags) {
+    Handle<ConstantElementsPair> constant_elements, int literal_index,
+    int flags) {
   size_t constant_elements_entry = GetConstantPoolEntry(constant_elements);
   OutputCreateArrayLiteral(constant_elements_entry, literal_index, flags);
   return *this;
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::CreateObjectLiteral(
     Handle<FixedArray> constant_properties, int literal_index, int flags,
     Register output) {
   size_t constant_properties_entry = GetConstantPoolEntry(constant_properties);
   OutputCreateObjectLiteral(constant_properties_entry, literal_index, flags,
@@ skipping 382 matching lines @@
     RegisterList reg_list) {
   DCHECK(RegisterListIsValid(reg_list));
   if (register_optimizer_)
     register_optimizer_->PrepareOutputRegisterList(reg_list);
   return static_cast<uint32_t>(reg_list.first_register().ToOperand());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8