Introduce LiteralsArray to hide it's implementation.

src/runtime/runtime-regexp.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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/conversions-inl.h"
 #include "src/isolate-inl.h"
 #include "src/messages.h"
@@ skipping 967 matching lines @@
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result, RegExpImpl::Compile(regexp, source, flags));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_MaterializeRegExpLiteral) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 4);
-  CONVERT_ARG_HANDLE_CHECKED(FixedArray, literals, 0);
+  CONVERT_ARG_HANDLE_CHECKED(LiteralsArray, literals, 0);
   CONVERT_SMI_ARG_CHECKED(index, 1);
   CONVERT_ARG_HANDLE_CHECKED(String, pattern, 2);
   CONVERT_ARG_HANDLE_CHECKED(String, flags, 3);
 
   Handle<JSFunction> constructor = isolate->regexp_function();
   // Compute the regular expression literal.
   Handle<Object> regexp;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, regexp,
       RegExpImpl::CreateRegExpLiteral(constructor, pattern, flags));
-  literals->set(index, *regexp);
+  literals->set_literal(index, *regexp);
   return *regexp;
 }
 
 
 // Only called from Runtime_RegExpExecMultiple so it doesn't need to maintain
 // separate last match info.  See comment on that function.
 template <bool has_capture>
 static Object* SearchRegExpMultiple(Isolate* isolate, Handle<String> subject,
                                     Handle<JSRegExp> regexp,
                                     Handle<JSArray> last_match_array,
@@ skipping 169 matching lines @@
 
 
 RUNTIME_FUNCTION(Runtime_IsRegExp) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_CHECKED(Object, obj, 0);
   return isolate->heap()->ToBoolean(obj->IsJSRegExp());
 }
 }  // namespace internal
 }  // namespace v8