dart2js: switching isolate is not 'PURE'

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

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 class SsaFunctionCompiler implements FunctionCompiler {
   final SsaCodeGeneratorTask generator;
   final SsaBuilderTask builder;
   final SsaOptimizerTask optimizer;
@@ skipping 4460 matching lines @@
           'Exactly one argument required.');
     }
     visit(node.arguments.head);
     String isolateName = backend.namer.staticStateHolder;
     SideEffects sideEffects = new SideEffects.empty();
     sideEffects.setAllSideEffects();
     push(new HForeignCode(
         js.js.parseForeignJS("$isolateName = #"),
         backend.dynamicType,
         <HInstruction>[pop()],
-        nativeBehavior: native.NativeBehavior.PURE,
+        nativeBehavior: native.NativeBehavior.CHANGES_STATIC_PROPERTY,
         effects: sideEffects));
   }
 
   void handleForeignJsGetStaticState(ast.Send node) {
     if (!node.arguments.isEmpty) {
       reporter.internalError(node.argumentsNode, 'Too many arguments.');
     }
     push(new HForeignCode(js.js.parseForeignJS(backend.namer.staticStateHolder),
                           backend.dynamicType,
                           <HInstruction>[]));
@@ skipping 4691 matching lines @@
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     JavaScriptBackend backend = builder.compiler.backend;
     ClassElement cls = backend.helpers.DynamicRuntimeType;
     builder.push(new HDynamicType(type, new TypeMask.exact(cls, classWorld)));
   }
 }