Issue 5215. Invocation identical(x,y) is compile-time constant

compiler/java/com/google/dart/compiler/resolver/Elements.java

Index: compiler/java/com/google/dart/compiler/resolver/Elements.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/Elements.java b/compiler/java/com/google/dart/compiler/resolver/Elements.java
index 6ced5c8e63b2d25020b7b86cce47dd94f132be10..f61f0703824dd0ad72063a1d5c0bcac54f50333d 100644
--- a/compiler/java/com/google/dart/compiler/resolver/Elements.java
+++ b/compiler/java/com/google/dart/compiler/resolver/Elements.java
@@ -736,6 +736,20 @@ static FieldElementImplementation fieldFromNode(DartField node,
   }
 
   /**
+   * @return <code>true</code> if given {@link Element} if {@link MethodElement} for
+   *         function "identical".
+   */
+  public static boolean isFunctionIdentical(Element element) {
+    if (element instanceof MethodElement) {
+      MethodElement methodElement = (MethodElement) element;
+      return Objects.equal(methodElement.getName(), "identical")
+          && methodElement.getEnclosingElement() instanceof LibraryElement
+          && methodElement.getEnclosingElement().getName().equals("dart://core/core.dart");
+    }
+    return false;
+  }
+  
+  /**
    * @return <code>true</code> if given {@link Element} if {@link MethodElement} for artificial
    *         "assert" statement.
    */