Implement TypeMask.isDisjoint instead of using intersection.

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

Index: pkg/compiler/lib/src/ssa/interceptor_simplifier.dart
diff --git a/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart b/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart
index 9cfb66bda09ca6182e050c78dfd49bc305db9a21..8d5e08f9d094d9a0c8d614a7964dc20ff2c2fe7a 100644
--- a/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart
+++ b/pkg/compiler/lib/src/ssa/interceptor_simplifier.dart
@@ -100,8 +100,7 @@ class SsaSimplifyInterceptors extends HBaseVisitor
     // All intercepted classes extend `Interceptor`, so if the receiver can't be
     // a class extending `Interceptor` then it can be called directly.
     return new TypeMask.nonNullSubclass(helpers.jsInterceptorClass, classWorld)
-        .intersection(receiver.instructionType, classWorld)
-        .isEmpty;
+        .isDisjoint(receiver.instructionType, classWorld);
   }
 
   HInstruction tryComputeConstantInterceptor(