Add instruction-set option to dex2oat

Change-Id: I3beefe28abb0ea8fc4697eded2793fd52e3f12c7
diff --git a/src/compiler.cc b/src/compiler.cc
index 5ca7023..26a6919 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -309,7 +309,7 @@
     case kX86:
       return x86::CreateJniDlsymLookupStub();
     default:
-      LOG(FATAL) << "Unknown InstructionSet: " << static_cast<int>(instruction_set);
+      LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
       return NULL;
   }
 }