Make RegExp's constructor non-const.

sdk/lib/_internal/compiler/implementation/native_handler.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library native;
 
 import 'dart:uri';
 import 'dart2jslib.dart' hide SourceString;
 import 'elements/elements.dart';
 import 'js_backend/js_backend.dart';
@@ skipping 157 matching lines @@
                         ClassElement cls,
                         NativeEmitter nativeEmitter) {
   List<ClassElement> subtypes = nativeEmitter.subtypes[cls];
   if (subtypes == null) return false;
   for (ClassElement subtype in subtypes) {
     if (subtype.lookupLocalMember(element.name) != null) return true;
   }
   return false;
 }
 
+final RegExp nativeRedirectionRegExp = new RegExp(r'^[a-zA-Z][a-zA-Z_$0-9]*$');
+
 void handleSsaNative(SsaBuilder builder, Expression nativeBody) {
   Compiler compiler = builder.compiler;
   FunctionElement element = builder.work.element;
   element.setNative();
   NativeEmitter nativeEmitter = builder.emitter.nativeEmitter;
   // If what we're compiling is a getter named 'typeName' and the native
   // class is named 'DOMType', we generate a call to the typeNameOf
   // function attached on the isolate.
   // The DOM classes assume that their 'typeName' property, which is
   // not a JS property on the DOM types, returns the type name.
@@ skipping 16 matching lines @@
     Element helper = builder.interceptors.getClosureConverter();
     builder.pushInvokeHelper2(helper, local, arity);
     HInstruction closure = builder.pop();
     return closure;
   }
 
   // Check which pattern this native method follows:
   // 1) foo() native; hasBody = false, isRedirecting = false
   // 2) foo() native "bar"; hasBody = false, isRedirecting = true
   // 3) foo() native "return 42"; hasBody = true, isRedirecting = false
-  RegExp nativeRedirectionRegExp = const RegExp(r'^[a-zA-Z][a-zA-Z_$0-9]*$');
   bool hasBody = false;
   bool isRedirecting = false;
   String nativeMethodName = element.name.slowToString();
   if (nativeBody != null) {
     LiteralString jsCode = nativeBody.asLiteralString();
     String str = jsCode.dartString.slowToString();
     if (nativeRedirectionRegExp.hasMatch(str)) {
       nativeMethodName = str;
       isRedirecting = true;
       nativeEmitter.addRedirectingMethod(element, nativeMethodName);
@@ skipping 106 matching lines @@
                                       String parameters) {
   buffer.add("  if (Object.getPrototypeOf(this).hasOwnProperty");
   buffer.add("('$methodName')) {\n");
   buffer.add("  $code");
   buffer.add("  } else {\n");
   buffer.add("    return Object.prototype.$methodName.call(this");
   buffer.add(parameters == '' ? '' : ', $parameters');
   buffer.add(");\n");
   buffer.add("  }\n");
 }