Revert "dart2js: simplify ssa-generate constant."

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

Index: pkg/compiler/lib/src/ssa/codegen.dart
diff --git a/pkg/compiler/lib/src/ssa/codegen.dart b/pkg/compiler/lib/src/ssa/codegen.dart
index 66451f76e2f6e6065b632d264065663f8e78ecf4..2eaad68c6cbf6998afc6dbbe0425909ba64ff31f 100644
--- a/pkg/compiler/lib/src/ssa/codegen.dart
+++ b/pkg/compiler/lib/src/ssa/codegen.dart
@@ -1813,9 +1813,27 @@ class SsaCodeGenerator implements HVisitor, HBlockInformationVisitor {
     }
   }
 
+  void generateConstant(ConstantValue constant) {
+    if (constant.isFunction) {
+      FunctionConstantValue function = constant;
+      registry.registerStaticUse(function.element);
+    }
+    if (constant.isType) {
+      // If the type is a web component, we need to ensure the constructors are
+      // available to 'upgrade' the native object.
+      TypeConstantValue type = constant;
+      Element element = type.representedType.element;
+      if (element != null && element.isClass) {
+        registry.registerTypeConstant(element);
+      }
+    }
+    push(backend.emitter.constantReference(constant));
+  }
+
   visitConstant(HConstant node) {
     assert(isGenerateAtUseSite(node));
-    push(backend.emitter.constantReference(node.constant));
+    generateConstant(node.constant);
+
     registry.registerCompileTimeConstant(node.constant);
     backend.constants.addCompileTimeConstantForEmission(node.constant);
   }