Handle parts as input in resolver.

pkg/compiler/lib/src/constants/constant_constructors.dart

Index: pkg/compiler/lib/src/constants/constant_constructors.dart
diff --git a/pkg/compiler/lib/src/constants/constant_constructors.dart b/pkg/compiler/lib/src/constants/constant_constructors.dart
index 996f8b13ccda1610f83e31fc6af7f7949235638d..7945601f13d6bf73096053f3dc8d083a824e1dc9 100644
--- a/pkg/compiler/lib/src/constants/constant_constructors.dart
+++ b/pkg/compiler/lib/src/constants/constant_constructors.dart
@@ -268,6 +268,18 @@ class ConstantConstructorComputer extends SemanticVisitor
   }
 
   @override
+  ConstantExpression visitEquals(Send node, Node left, Node right, _) {
+    return new BinaryConstantExpression(
+        apply(left), BinaryOperator.EQ, apply(right));
+  }
+
+  @override
+  ConstantExpression visitNotEquals(Send node, Node left, Node right, _) {
+    return new BinaryConstantExpression(
+        apply(left), BinaryOperator.NOT_EQ, apply(right));
+  }
+
+  @override
   ConstantExpression visitUnary(
       Send node, UnaryOperator operator, Node expression, _) {
     return new UnaryConstantExpression(operator, apply(expression));