Support serialization of WorldImpact

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 a3fc43c35d1f34f39e55ddb8d88b1f45f25bd0b2..410532c1bdc0ee41dca3682154271268210f2bb4 100644
--- a/pkg/compiler/lib/src/ssa/codegen.dart
+++ b/pkg/compiler/lib/src/ssa/codegen.dart
@@ -1598,7 +1598,7 @@ class SsaCodeGenerator implements HVisitor, HBlockInformationVisitor {
         // A direct (i.e. non-interceptor) native call is the result of
         // optimization.  The optimization ensures any type checks or
         // conversions have been satisified.
-        methodName = backend.getFixedBackendName(target);
+        methodName = backend.nativeData.getFixedBackendName(target);
       }
     }