nir: extract out helper macros for running passes

Note these are a bit uglier, due to avoidance of GNU C extensions.  But
drivers which do not need to be built with compilers that don't support
the extension can wrap these macros with their own.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/glsl/nir/nir.h

 void nir_validate_shader(nir_shader *shader);
 void nir_metadata_set_validation_flag(nir_shader *shader);
 void nir_metadata_check_validation_flag(nir_shader *shader);
+
+#include "util/debug.h"
+static inline bool
+should_clone_nir(void)
+{
+   static int should_clone = -1;
+   if (should_clone < 0)
+      should_clone = env_var_as_boolean("NIR_TEST_CLONE", false);
+
+   return should_clone;
+}
 #else
 static inline void nir_validate_shader(nir_shader *shader) { (void) shader; }
 static inline void nir_metadata_set_validation_flag(nir_shader *shader) { (void) shader; }
 static inline void nir_metadata_check_validation_flag(nir_shader *shader) { (void) shader; }
+static inline bool should_clone_nir(void) { return false; }
 #endif /* DEBUG */
 
+#define _PASS(nir, do_pass) do {                                     \
+   do_pass                                                           \
+   nir_validate_shader(nir);                                         \
+   if (should_clone_nir()) {                                         \
+      nir_shader *clone = nir_shader_clone(ralloc_parent(nir), nir); \
+      ralloc_free(nir);                                              \
+      nir = clone;                                                   \
+   }                                                                 \
+} while (0)
+
+#define NIR_PASS(progress, nir, pass, ...) _PASS(nir,                \
+   nir_metadata_set_validation_flag(nir);                            \
+   if (pass(nir, ##__VA_ARGS__)) {                                   \
+      progress = true;                                               \
+      nir_metadata_check_validation_flag(nir);                       \
+   }                                                                 \
+)
+
+#define NIR_PASS_V(nir, pass, ...) _PASS(nir,                        \
+   pass(nir, ##__VA_ARGS__);                                         \
+)
+
 void nir_calc_dominance_impl(nir_function_impl *impl);
 void nir_calc_dominance(nir_shader *shader);
 

src/mesa/drivers/dri/i965/brw_nir.c

    }
 }
 
-#include "util/debug.h"
-
-static bool
-should_clone_nir()
-{
-   static int should_clone = -1;
-   if (should_clone < 1)
-      should_clone = env_var_as_boolean("NIR_TEST_CLONE", false);
-
-   return should_clone;
-}
-
-#define _OPT(do_pass) (({                                            \
-   bool this_progress = true;                                        \
-   do_pass                                                           \
-   nir_validate_shader(nir);                                         \
-   if (should_clone_nir()) {                                         \
-      nir_shader *clone = nir_shader_clone(ralloc_parent(nir), nir); \
-      ralloc_free(nir);                                              \
-      nir = clone;                                                   \
-   }                                                                 \
-   this_progress;                                                    \
-}))
-
-#define OPT(pass, ...) _OPT(                   \
-   nir_metadata_set_validation_flag(nir);      \
-   this_progress = pass(nir ,##__VA_ARGS__);   \
-   if (this_progress) {                        \
-      progress = true;                         \
-      nir_metadata_check_validation_flag(nir); \
-   }                                           \
-)
-
-#define OPT_V(pass, ...) _OPT( \
-   pass(nir, ##__VA_ARGS__);   \
-)
+#define OPT(pass, ...) ({                                  \
+   bool this_progress = false;                             \
+   NIR_PASS(this_progress, nir, pass, ##__VA_ARGS__);      \
+   if (this_progress)                                      \
+      progress = true;                                     \
+   this_progress;                                          \
+})
+
+#define OPT_V(pass, ...) NIR_PASS_V(nir, pass, ##__VA_ARGS__)
 
 static nir_shader *
 nir_optimize(nir_shader *nir, bool is_scalar)