Handle use of fromEnvironment from serialized data.

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

Index: pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
diff --git a/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart b/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
index 2bc367096676516be426167c5ad822175ff8150a..ea9e8936c93e46883fcfed13a49ae9505fbab361 100644
--- a/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
+++ b/pkg/compiler/lib/src/inferrer/type_graph_nodes.dart
@@ -494,15 +494,18 @@ class MemberTypeInformation extends ElementTypeInformation
     }
 
     Compiler compiler = inferrer.compiler;
-    if (element.declaration == compiler.intEnvironment) {
-      giveUp(inferrer);
-      return compiler.typesTask.intType.nullable();
-    } else if (element.declaration == compiler.boolEnvironment) {
-      giveUp(inferrer);
-      return compiler.typesTask.boolType.nullable();
-    } else if (element.declaration == compiler.stringEnvironment) {
-      giveUp(inferrer);
-      return compiler.typesTask.stringType.nullable();
+    if (element.isConstructor) {
+      ConstructorElement constructor = element;
+      if (constructor.isIntFromEnvironmentConstructor) {
+        giveUp(inferrer);
+        return compiler.typesTask.intType.nullable();
+      } else if (constructor.isBoolFromEnvironmentConstructor) {
+        giveUp(inferrer);
+        return compiler.typesTask.boolType.nullable();
+      } else if (constructor.isStringFromEnvironmentConstructor) {
+        giveUp(inferrer);
+        return compiler.typesTask.stringType.nullable();
+      }
     }
     return null;
   }