Migrated test block 19 to Dart 2.0.

tests/corelib_2/regexp/global_test.dart

Index: tests/corelib_2/regexp/global_test.dart
diff --git a/tests/corelib_strong/regexp/global_test.dart b/tests/corelib_2/regexp/global_test.dart
similarity index 98%
rename from tests/corelib_strong/regexp/global_test.dart
rename to tests/corelib_2/regexp/global_test.dart
index 1954916dd14e5b8ee4a7a3e6dc859a7fb21a390f..a19b7f7cf721fffcd34c0e8075ea9dee140b3710 100644
--- a/tests/corelib_strong/regexp/global_test.dart
+++ b/tests/corelib_2/regexp/global_test.dart
@@ -60,7 +60,7 @@ void main() {
   str = str.replaceAllMapped(new RegExp(r"(FOUR|TWO) LEGS (GOOD|BAD)"), (m) {
     if (m.group(1) == "FOUR") assertTrue(m.group(2) == "GOOD");
     if (m.group(1) == "TWO") assertTrue(m.group(2) == "BAD");
-    return m.group(0).length - 10;
+    return (m.group(0).length - 10).toString();
   });
   assertEquals("4, 2!", str);
 
@@ -96,7 +96,7 @@ void main() {
   str = str.replaceAllMapped(new RegExp(r"(FOUR|TWO) \u817f (GOOD|BAD)"), (m) {
     if (m.group(1) == "FOUR") assertTrue(m.group(2) == "GOOD");
     if (m.group(1) == "TWO") assertTrue(m.group(2) == "BAD");
-    return m.group(0).length - 7;
+    return (m.group(0).length - 7).toString();
   });
   assertEquals("4, 2!", str);