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

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

Index: pkg/compiler/lib/src/ssa/locals_handler.dart
diff --git a/pkg/compiler/lib/src/ssa/locals_handler.dart b/pkg/compiler/lib/src/ssa/locals_handler.dart
index 1738879427ad5014f156d01da65eff2177b455df..dd364805efdaf0dea863b547f9fd2ff03b8f4dd4 100644
--- a/pkg/compiler/lib/src/ssa/locals_handler.dart
+++ b/pkg/compiler/lib/src/ssa/locals_handler.dart
@@ -85,8 +85,6 @@ class LocalsHandler {
     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.