Introduce {ConstantElementsPair} struct for type safety.

src/compiler/js-operator.cc

 // Copyright 2014 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/compiler/js-operator.h"
 
 #include <limits>
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
@@ skipping 836 matching lines @@
     Handle<SharedFunctionInfo> shared_info, PretenureFlag pretenure) {
   CreateClosureParameters parameters(shared_info, pretenure);
   return new (zone()) Operator1<CreateClosureParameters>(  // --
       IrOpcode::kJSCreateClosure, Operator::kNoThrow,      // opcode
       "JSCreateClosure",                                   // name
       0, 1, 1, 1, 1, 0,                                    // counts
       parameters);                                         // parameter
 }
 
 const Operator* JSOperatorBuilder::CreateLiteralArray(
-    Handle<FixedArray> constant_elements, int literal_flags, int literal_index,
-    int number_of_elements) {
+    Handle<ConstantElementsPair> constant_elements, int literal_flags,
+    int literal_index, int number_of_elements) {
   CreateLiteralParameters parameters(constant_elements, number_of_elements,
                                      literal_flags, literal_index);
   return new (zone()) Operator1<CreateLiteralParameters>(        // --
       IrOpcode::kJSCreateLiteralArray, Operator::kNoProperties,  // opcode
       "JSCreateLiteralArray",                                    // name
       1, 1, 1, 1, 1, 2,                                          // counts
       parameters);                                               // parameter
 }
 
 const Operator* JSOperatorBuilder::CreateLiteralObject(
@@ skipping 63 matching lines @@
   return new (zone()) Operator1<Handle<ScopeInfo>>(               // --
       IrOpcode::kJSCreateScriptContext, Operator::kNoProperties,  // opcode
       "JSCreateScriptContext",                                    // name
       1, 1, 1, 1, 1, 2,                                           // counts
       scpope_info);                                               // parameter
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8