Move parseInt parseDouble to int/double classes as a static method.

lib/compiler/implementation/lib/core_patch.dart

Index: lib/compiler/implementation/lib/core_patch.dart
diff --git a/lib/compiler/implementation/lib/core_patch.dart b/lib/compiler/implementation/lib/core_patch.dart
index 9d374415812fa5186686f1a06696c320f382030c..bc881b3391220ec29540977276584feb97808576 100644
--- a/lib/compiler/implementation/lib/core_patch.dart
+++ b/lib/compiler/implementation/lib/core_patch.dart
@@ -57,3 +57,11 @@ patch class Expando<T> {
   static const String _EXPANDO_PROPERTY_NAME = 'expando\$values';
   static int _keyCount = 0;
 }
+
+patch class int {
+  patch static int parse(String string) => Primitives.parseInt(string);
+}
+
+patch class double {
+  patch static double parse(String string) => Primitives.parseDouble(string);
+}