Fix some typos in ART.

Test: m build-art-host
Test: m cpplint-art
Change-Id: Ifc6ce3d0d645c4a8dca72dd483fc03fc05077130
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index faf8b41..c03ffca 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -284,7 +284,7 @@
       verification_results_(verification_results),
       compiler_(Compiler::Create(this, compiler_kind)),
       compiler_kind_(compiler_kind),
-      instruction_set_(instruction_set == kArm ? kThumb2: instruction_set),
+      instruction_set_(instruction_set == kArm ? kThumb2 : instruction_set),
       instruction_set_features_(instruction_set_features),
       requires_constructor_barrier_lock_("constructor barrier lock"),
       compiled_classes_lock_("compiled classes lock"),
@@ -1251,7 +1251,7 @@
     }
   }
 
-  // java.lang.Reference visitor for VisitReferences.
+  // java.lang.ref.Reference visitor for VisitReferences.
   void operator()(ObjPtr<mirror::Class> klass ATTRIBUTE_UNUSED,
                   ObjPtr<mirror::Reference> ref ATTRIBUTE_UNUSED) const {}