Quick compiler: more refactoring

Focus on header file cleanup here.  Note: target_list.h
is transitional, and upcoming CLs will do additional header
file reorganization.

Change-Id: If86e1a8c1c43305762fe37b157a9d3c17d911ea7
diff --git a/src/compiler/codegen/x86/assemble_x86.cc b/src/compiler/codegen/x86/assemble_x86.cc
index 79ed075..63d2b83 100644
--- a/src/compiler/codegen/x86/assemble_x86.cc
+++ b/src/compiler/codegen/x86/assemble_x86.cc
@@ -14,10 +14,8 @@
  * limitations under the License.
  */
 
-#include "../../dalvik.h"
-#include "../../compiler_internals.h"
 #include "x86_lir.h"
-#include "codegen.h"
+#include "../codegen_util.h"
 
 namespace art {