Rename the global inference task and reduce it's API surface by introducing the

pkg/compiler/lib/src/ssa/locals_handler.dart

 // Copyright (c) 2016, 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.
 
 import '../closure.dart';
 import '../common.dart';
 import '../compiler.dart' show Compiler;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../io/source_information.dart';
@@ skipping 67 matching lines @@
       if (typeContext != null) {
         type = type.substByContext(contextClass.asInstanceOf(typeContext));
       }
     }
     if (instanceType != null) {
       type = type.substByContext(instanceType);
     }
     return type;
   }
 
-  get typesTask => compiler.typesTask;
-
   /// Creates a new [LocalsHandler] based on [other]. We only need to
   /// copy the [directLocals], since the other fields can be shared
   /// throughout the AST visit.
   LocalsHandler.from(LocalsHandler other)
       : directLocals = new Map<Local, HInstruction>.from(other.directLocals),
         redirectionMapping = other.redirectionMapping,
         executableContext = other.executableContext,
         instanceType = other.instanceType,
         builder = other.builder,
         closureData = other.closureData,
@@ skipping 548 matching lines @@
     return cachedTypesOfCapturedVariables.putIfAbsent(element, () {
       return TypeMaskFactory.inferredTypeForElement(element, compiler);
     });
   }
 
   /// Variables stored in the current activation. These variables are
   /// being updated in try/catch blocks, and should be
   /// accessed indirectly through [HLocalGet] and [HLocalSet].
   Map<Local, HLocalValue> activationVariables = <Local, HLocalValue>{};
 }