Collect call site information and use that for estimating parameter types

lib/compiler/implementation/universe.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class Universe {
   Map<Element, CodeBuffer> generatedCode;
   Map<Element, CodeBuffer> generatedBailoutCode;
   final Set<ClassElement> instantiatedClasses;
   final Set<SourceString> instantiatedClassInstanceFields;
   final Set<FunctionElement> staticFunctionsNeedingGetter;
@@ skipping 265 matching lines @@
     if (namedArguments.isEmpty()) return namedArguments;
     if (!orderedNamedArguments.isEmpty()) return orderedNamedArguments;
 
     orderedNamedArguments.addAll(namedArguments);
     orderedNamedArguments.sort((SourceString first, SourceString second) {
       return first.slowToString().compareTo(second.slowToString());
     });
     return orderedNamedArguments;
   }
 
-  toString() => '$kind $argumentCount';
+  toString() => 'Selector($kind, $argumentCount)';
 }
 
 class TypedSelector extends Selector {
   /**
    * The type of the receiver. Any subtype of that type can be the
    * target of the invocation.
    */
   final Type receiverType;
 
   TypedSelector(this.receiverType, Selector selector)
@@ skipping 49 matching lines @@
     }
 
     return false;
   }
 
   bool operator ==(other) {
     if (other is !TypedSelector) return false;
     if (other.receiverType !== receiverType) return false;
     return super == other;
   }
+
+  toString() => 'TypedSelector($kind, $receiverType, $argumentCount)';
 }