Refactoring if block-information.

lib/compiler/implementation/native_handler.dart

Index: lib/compiler/implementation/native_handler.dart
diff --git a/lib/compiler/implementation/native_handler.dart b/lib/compiler/implementation/native_handler.dart
index 8ba0b64ba5fc09d233e980a7ad418e8a2aa6da14..41f45aa234c93a87841bcd26ef37b2ff7adb0d00 100644
--- a/lib/compiler/implementation/native_handler.dart
+++ b/lib/compiler/implementation/native_handler.dart
@@ -330,11 +330,13 @@ void handleSsaNative(SsaBuilder builder, Send node) {
           new DartString.literal('$dartMethodName'));
       DartString jsCode = new DartString.literal(
           'Object.getPrototypeOf(#).hasOwnProperty(#)');
-      builder.push(new HForeign(
-          jsCode, const LiteralDartString('Object'),
-          <HInstruction>[builder.localsHandler.readThis(), constant]));
+      visitCondition() {
+        builder.push(new HForeign(
+            jsCode, const LiteralDartString('Object'),
+            <HInstruction>[builder.localsHandler.readThis(), constant]));
+      }
 
-      builder.handleIf(visitThen, visitElse);
+      builder.handleIf(visitCondition, visitThen, visitElse);
 
       HPhi phi = new HPhi.manyInputs(
           null, <HInstruction>[thenInstruction, elseInstruction]);