dart2js allocation tweaks

pkg/compiler/lib/src/io/location_provider.dart

Index: pkg/compiler/lib/src/io/location_provider.dart
diff --git a/pkg/compiler/lib/src/io/location_provider.dart b/pkg/compiler/lib/src/io/location_provider.dart
index 1ac9af76e7429e52f5d41ff655691939e2baeff4..a015babe4aedbf2142eea6618ad295639bb7187a 100644
--- a/pkg/compiler/lib/src/io/location_provider.dart
+++ b/pkg/compiler/lib/src/io/location_provider.dart
@@ -39,8 +39,7 @@ class LocationCollector extends CodeOutputListener implements LocationProvider {
 
   @override
   Location getLocation(int offset) {
-    RangeError.checkValueInInterval(offset, 0, length, "offset",
-        "The value of 'offset' ($offset) must be between 0 and $length.");
+    RangeError.checkValueInInterval(offset, 0, length, 'offset');
     return new Source(lineStarts, null).getLocation(null, offset);
   }