Setup local var descriptors in kernel mode.

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
diff --git a/runtime/vm/compiler.cc b/runtime/vm/compiler.cc
index 8f06434fe7ec1c4f97cf93c7cd5638996af4a081..41a32c583bdae2baadbf7c30bac8af5d89a9121a 100644
--- a/runtime/vm/compiler.cc
+++ b/runtime/vm/compiler.cc
@@ -1595,8 +1595,12 @@ void Compiler::ComputeLocalVarDescriptors(const Code& code) {
   // if state changed while compiling in background.
   LongJumpScope jump;
   if (setjmp(*jump.Set()) == 0) {
-    Parser::ParseFunction(parsed_function);
-    parsed_function->AllocateVariables();
+    if (function.kernel_function() == NULL) {
+      Parser::ParseFunction(parsed_function);
+      parsed_function->AllocateVariables();
+    } else {
+      parsed_function->EnsureKernelScopes();
+    }
     const LocalVarDescriptors& var_descs = LocalVarDescriptors::Handle(
         parsed_function->node_sequence()->scope()->GetVarDescriptors(function));
     ASSERT(!var_descs.IsNull());