Store constant variable initializers in elements.

pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart

Index: pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
diff --git a/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart b/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
index 1cfc52a9c5b7015a64355a3361d728424dcb588f..29364327f6d8f371524dd7a321761b5afa03dc3c 100644
--- a/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
+++ b/pkg/compiler/lib/src/inferrer/type_graph_inferrer.dart
@@ -850,8 +850,8 @@ class TypeGraphInferrerEngine
           if (type is! ListTypeInformation && type is! MapTypeInformation) {
             // For non-container types, the constant handler does
             // constant folding that could give more precise results.
-            ConstantValue value =
-                compiler.backend.constants.getConstantValueForVariable(element);
+            ConstantValue value = compiler.backend.constants
+                .getConstantValue(fieldElement.constant);
             if (value != null) {
               if (value.isFunction) {
                 FunctionConstantValue functionConstant = value;