Make CTX allocatable by the register allocator.

runtime/vm/unit_test.cc

Index: runtime/vm/unit_test.cc
===================================================================
--- runtime/vm/unit_test.cc	(revision 41393)
+++ runtime/vm/unit_test.cc	(working copy)
@@ -217,11 +217,14 @@
 
 
 void CodeGenTest::Compile() {
+  if (function_.HasCode()) return;
   ParsedFunction* parsed_function =
       new ParsedFunction(Isolate::Current(), function_);
   parsed_function->SetNodeSequence(node_sequence_);
   parsed_function->set_instantiator(NULL);
   parsed_function->set_default_parameter_values(default_parameter_values_);
+  node_sequence_->scope()->AddVariable(
+      parsed_function->current_context_var());
   parsed_function->EnsureExpressionTemp();
   node_sequence_->scope()->AddVariable(parsed_function->expression_temp_var());
   parsed_function->AllocateVariables();
@@ -231,19 +234,6 @@
 }
 
 
-LocalVariable* CodeGenTest::CreateTempConstVariable(const char* name_part) {
-  char name[64];
-  OS::SNPrint(name, 64, ":%s", name_part);
-  LocalVariable* temp =
-      new LocalVariable(0,
-                        String::ZoneHandle(Symbols::New(name)),
-                        Type::ZoneHandle(Type::DynamicType()));
-  temp->set_is_final();
-  node_sequence_->scope()->AddVariable(temp);
-  return temp;
-}
-
-
 bool CompilerTest::TestCompileScript(const Library& library,
                                      const Script& script) {
   Isolate* isolate = Isolate::Current();