Recognize const/fixed/growable arrays in simple types inferrer.

sdk/lib/_internal/compiler/implementation/js_backend/backend.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/backend.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/js_backend/backend.dart	(revision 19761)
+++ sdk/lib/_internal/compiler/implementation/js_backend/backend.dart	(working copy)
@@ -662,7 +662,6 @@
 
   Element getInterceptorMethod;
   Element interceptedNames;
-  Element fixedLengthListConstructor;
 
   bool seenAnyClass = false;
 
@@ -1573,6 +1572,9 @@
   ClassElement get numImplementation => jsNumberClass;
   ClassElement get stringImplementation => jsStringClass;
   ClassElement get listImplementation => jsArrayClass;
+  ClassElement get constListImplementation => jsArrayClass;
+  ClassElement get fixedListImplementation => jsFixedArrayClass;
+  ClassElement get growableListImplementation => jsExtendableArrayClass;
   ClassElement get mapImplementation => mapLiteralClass;
   ClassElement get constMapImplementation => constMapLiteralClass;
   ClassElement get functionImplementation => jsFunctionClass;