Add TypeUse.

pkg/compiler/lib/src/ssa/builder.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.
 
 part of ssa;
 
 class SsaFunctionCompiler implements FunctionCompiler {
   final SsaCodeGeneratorTask generator;
   final SsaBuilderTask builder;
   final SsaOptimizerTask optimizer;
@@ skipping 2572 matching lines @@
     Element element = type.element;
     TypeMask mask = new TypeMask.subtype(element, compiler.world);
     return new HTypeKnown.pinned(mask, original);
   }
 
   HInstruction _checkType(HInstruction original, DartType type, int kind) {
     assert(compiler.enableTypeAssertions);
     assert(type != null);
     type = localsHandler.substInContext(type);
     HInstruction other = buildTypeConversion(original, type, kind);
-    registry?.registerIsCheck(type);
+    registry?.registerTypeUse(new TypeUse.isCheck(type));
     return other;
   }
 
   HInstruction potentiallyCheckOrTrustType(HInstruction original, DartType type,
       { int kind: HTypeConversion.CHECKED_MODE_CHECK }) {
     if (type == null) return original;
     HInstruction checkedOrTrusted = original;
     if (compiler.trustTypeAnnotations) {
       checkedOrTrusted = _trustType(original, type);
     } else if (compiler.enableTypeAssertions) {
@@ skipping 6544 matching lines @@
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     JavaScriptBackend backend = builder.compiler.backend;
     ClassElement cls = backend.helpers.DynamicRuntimeType;
     builder.push(new HDynamicType(type, new TypeMask.exact(cls, classWorld)));
   }
 }