Emit the type test support code to the right output unit.

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
index 93241b7f705585424d66301d5b8c4b585d3c8c00..2f81f2d981126de5a93d3f680db7a081043b5261 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
@@ -1381,16 +1381,15 @@ mainBuffer.add(r'''
         emitFinishClassesInvocationIfNecessary(mainBuffer);
         classesCollector = oldClassesCollector;
       }
-
-      typeTestEmitter.emitRuntimeTypeSupport(mainBuffer);
+      OutputUnit mainOutputUnit = compiler.deferredLoadTask.mainOutputUnit;
+      typeTestEmitter.emitRuntimeTypeSupport(mainBuffer, mainOutputUnit);
       interceptorEmitter.emitGetInterceptorMethods(mainBuffer);
       interceptorEmitter.emitOneShotInterceptors(mainBuffer);
       // Constants in checked mode call into RTI code to set type information
       // which may need getInterceptor (and one-shot interceptor) methods, so
       // we have to make sure that [emitGetInterceptorMethods] and
       // [emitOneShotInterceptors] have been called.
-      emitCompileTimeConstants(
-          mainBuffer, compiler.deferredLoadTask.mainOutputUnit);
+      emitCompileTimeConstants(mainBuffer, mainOutputUnit);
 
       // We write a javascript mapping from DeferredLibrary elements
       // (really their String argument) to the js hunk to load.
@@ -1569,6 +1568,8 @@ if (typeof $printHelperName === "function") {
 
       classesCollector = oldClassesCollector;
 
+      typeTestEmitter.emitRuntimeTypeSupport(buffer, outputUnit);
+
       emitCompileTimeConstants(buffer, outputUnit);
 
       String code = buffer.getText();