i965: Define FIRST_SPILL_MRF and FIRST_PULL_LOAD_MRF only once and in one place

That should make tracking where we do spills and pull loads a bit easier.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/brw_fs.cpp

@@ -50,8 +50,6 @@
 #include "glsl/glsl_types.h"
 #include "program/sampler.h"
 
-#define FIRST_PULL_LOAD_MRF(gen) ((gen) == 6 ? 16 : 13)
-
 using namespace brw;
 
 void

src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp

@@ -30,8 +30,6 @@
 #include "glsl/glsl_types.h"
 #include "glsl/ir_optimization.h"
 
-#define FIRST_SPILL_MRF(gen) (gen == 6 ? 21 : 13)
-
 using namespace brw;
 
 static void

src/mesa/drivers/dri/i965/brw_inst.h

@@ -42,6 +42,12 @@ extern "C" {
 /** Maximum SEND message length */
 #define BRW_MAX_MSG_LENGTH 15
 
+/** First MRF register used by pull loads */
+#define FIRST_SPILL_MRF(gen) ((gen) == 6 ? 21 : 13)
+
+/** First MRF register used by spills */
+#define FIRST_PULL_LOAD_MRF(gen) ((gen) == 6 ? 16 : 13)
+
 /* brw_context.h has a forward declaration of brw_inst, so name the struct. */
 typedef struct brw_inst {
    uint64_t data[2];

src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp

@@ -26,9 +26,6 @@
 #include "glsl/ir_uniform.h"
 #include "program/sampler.h"
 
-#define FIRST_SPILL_MRF(gen) (gen == 6 ? 21 : 13)
-#define FIRST_PULL_LOAD_MRF(gen) (gen == 6 ? 16 : 13)
-
 namespace brw {
 
 vec4_instruction::vec4_instruction(enum opcode opcode, const dst_reg &dst,