Avoiding creating strings for canonicalization

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 1c186212694876c7909eda328c59ccf9aa9a6434..0f10c4116faabc1138a0cfa61ea9b3a79af8054c 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -474,7 +474,7 @@ abstract class Compiler implements LibraryLoaderListener {
     // multiple times. Implement a better mechanism where we can store
     // such caches in the compiler and get access to them through a
     // suitably maintained static reference to the current compiler.
-    StringToken.canonicalizedSubstrings.clear();
+    StringToken.canonicalizer.clear();
     Selector.canonicalizedValues.clear();
 
     // The selector objects held in static fields must remain canonical.