[js-perf-test] Move SubRegExp class definition outside loop

test/js-perf-test/RegExp/base_ctor.js

 // Copyright 2016 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.
 
 function SimpleCtor() {
   new RegExp("[Cz]");
 }
 
 function FlagsCtor() {
   new RegExp("[Cz]", "guiym");
 }
 
 function SimpleCtorWithoutNew() {
   RegExp("[Cz]");
 }
 
 function FlagsCtorWithoutNew() {
   RegExp("[Cz]", "guiym");
 }
 
 function CtorWithRegExpPattern() {
   new RegExp(/[Cz]/);
 }
 
 function CtorWithRegExpPatternAndFlags() {
   new RegExp(/[Cz]/, "guiym");
 }
 
+class SubRegExp extends RegExp {
+  get source() { return "[Cz]"; }
+  get flags() { return "guiym"; }
+}
+
 function CtorWithRegExpSubclassPattern() {
-  class SubRegExp extends RegExp {
-    get source() { return "[Cz]"; }
-    get flags() { return "guiym"; }
-  }
   new RegExp(new SubRegExp(/[Cz]/));
 }
 
 function CtorWithUndefinedPattern() {
   new RegExp();
 }
 
 function CtorWithFlagsAndUndefinedPattern() {
   new RegExp(undefined, "guiym");
 }
 
 var benchmarks = [ [SimpleCtor, undefined],
                    [FlagsCtor, undefined],
                    [SimpleCtorWithoutNew, undefined],
                    [FlagsCtorWithoutNew, undefined],
                    [CtorWithRegExpPattern, undefined],
                    [CtorWithRegExpPatternAndFlags, undefined],
                    [CtorWithRegExpSubclassPattern, undefined],
                    [CtorWithUndefinedPattern, undefined],
                    [CtorWithFlagsAndUndefinedPattern, undefined],
                  ];