Make RegExp's constructor non-const.

tests/compiler/dart2js/type_inference_test.dart

Index: tests/compiler/dart2js/type_inference_test.dart
diff --git a/tests/compiler/dart2js/type_inference_test.dart b/tests/compiler/dart2js/type_inference_test.dart
index 0b4de27cd88f2e4c8b03176b28ec26d4119b9397..f82f15b17567fe3dd1ebfe80cda1b975261b1a9f 100644
--- a/tests/compiler/dart2js/type_inference_test.dart
+++ b/tests/compiler/dart2js/type_inference_test.dart
@@ -73,14 +73,14 @@ main() {
   RegExp regexp = new RegExp(getNumberTypeCheck('a'));
   Expect.isTrue(!regexp.hasMatch(generated));
 
-  regexp = const RegExp('-a');
+  regexp = new RegExp('-a');
   Expect.isTrue(!regexp.hasMatch(generated));
 
   generated = compile(TEST_TWO_WITH_BAILOUT, entry: 'foo');
   regexp = new RegExp(getNumberTypeCheck('a'));
   Expect.isTrue(regexp.hasMatch(generated));
 
-  regexp = const RegExp('-a');
+  regexp = new RegExp('-a');
   Expect.isTrue(regexp.hasMatch(generated));
 
   generated = compile(TEST_THREE, entry: 'foo');
@@ -92,19 +92,19 @@ main() {
   Expect.isTrue(regexp.hasMatch(generated));
 
   generated = compile(TEST_FIVE, entry: 'foo');
-  regexp = const RegExp('a.constructor !== Array');
+  regexp = new RegExp('a.constructor !== Array');
   Expect.isTrue(!regexp.hasMatch(generated));
   Expect.isTrue(generated.contains('index'));
   Expect.isTrue(generated.contains('indexSet'));
 
   generated = compile(TEST_FIVE_WITH_BAILOUT, entry: 'foo');
-  regexp = const RegExp('a.constructor !== Array');
+  regexp = new RegExp('a.constructor !== Array');
   Expect.isTrue(regexp.hasMatch(generated));
   Expect.isTrue(!generated.contains('index'));
   Expect.isTrue(!generated.contains('indexSet'));
 
   generated = compile(TEST_SIX, entry: 'foo');
-  regexp = const RegExp('a.constructor !== Array');
+  regexp = new RegExp('a.constructor !== Array');
   Expect.isTrue(regexp.hasMatch(generated));
   Expect.isTrue(!generated.contains('index'));
   Expect.isTrue(!generated.contains('indexSet'));