assembler: Group the header inclusions together

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

assembler/gen4asm.h

@@ -34,6 +34,8 @@
 #include <assert.h>
 
 #include "brw_reg.h"
+#include "brw_defines.h"
+#include "brw_structs.h"
 
 extern long int gen_level;
 extern int advanced_flag;
@@ -57,9 +59,6 @@ extern struct brw_compile genasm_compile;
 /* Predicate to match Haswell processors */
 #define IS_HASWELL(x) (gen_level == 75)
 
-#include "brw_defines.h"
-#include "brw_structs.h"
-
 void yyerror (char *msg);
 
 #define STRUCT_SIZE_ASSERT(TYPE, SIZE) \