Fix register allocator test.

Change-Id: I87481757d6f59bf2d6127571f58f11b5372b3a06
diff --git a/compiler/optimizing/register_allocator_test.cc b/compiler/optimizing/register_allocator_test.cc
index fa1e01f..cb5010a 100644
--- a/compiler/optimizing/register_allocator_test.cc
+++ b/compiler/optimizing/register_allocator_test.cc
@@ -815,7 +815,7 @@
   locations = new (&allocator) LocationSummary(fourth->GetDefinedBy(), LocationSummary::kNoCall);
   locations->SetOut(Location::RequiresRegister());
 
-  x86::CodeGeneratorX86 codegen(graph);
+  x86::CodeGeneratorX86 codegen(graph, CompilerOptions());
   SsaLivenessAnalysis liveness(*graph, &codegen);
 
   RegisterAllocator register_allocator(&allocator, &codegen, liveness);