Various token issues fixed in the compiler

lib/compiler/implementation/compiler.dart

Index: lib/compiler/implementation/compiler.dart
diff --git a/lib/compiler/implementation/compiler.dart b/lib/compiler/implementation/compiler.dart
index abe75124f1f350c7fb34a3b41bcd78309b4e5939..5fa27f9cb26bb7146a299d4a3f84346da284928b 100644
--- a/lib/compiler/implementation/compiler.dart
+++ b/lib/compiler/implementation/compiler.dart
@@ -893,7 +893,7 @@ class SourceSpan {
   static withCharacterOffsets(Token begin, Token end,
                      f(int beginOffset, int endOffset)) {
     final beginOffset = begin.charOffset;
-    final endOffset = end.charOffset + end.slowCharLength;
+    final endOffset = end.charOffset + end.slowCharCount;
 
     // [begin] and [end] might be the same for the same empty token. This
     // happens for instance when scanning '$$'.