Kill constants.h and fix some copyright headers.

Change-Id: I51c04d731d6de035328781d8ac134ad6fcf49897
diff --git a/src/oat/utils/x86/assembler_x86.h b/src/oat/utils/x86/assembler_x86.h
index f7d26ff..886e173 100644
--- a/src/oat/utils/x86/assembler_x86.h
+++ b/src/oat/utils/x86/assembler_x86.h
@@ -18,7 +18,7 @@
 #define ART_SRC_OAT_UTILS_X86_ASSEMBLER_X86_H_
 
 #include <vector>
-#include "constants.h"
+#include "constants_x86.h"
 #include "globals.h"
 #include "managed_register_x86.h"
 #include "macros.h"