genxml: generate opencl temporary variables with private qualifier

To avoid generic pointers, makes the NIR prints a bit more readable.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Acked-by: Caio Oliveira <caio.oliveira@intel.com>
Fixes: 41b2ed65 ("genxml: generate opencl packing headers")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27637>

src/intel/genxml/gen_pack_header.py

@@ -521,7 +521,7 @@ class Parser(object):
                 static inline __attribute__((always_inline)) void
                 %s_repack(__attribute__((unused)) global void * restrict dst,
                         %s__attribute__((unused)) global const uint32_t * origin,
-                        %s__attribute__((unused)) const struct %s * restrict values)
+                        %s__attribute__((unused)) private const struct %s * restrict values)
                 {""") % (name, ' ' * len(name), ' ' * len(name), name))
             else:
                 print(textwrap.dedent("""\
@@ -536,7 +536,7 @@ class Parser(object):
                 print(textwrap.dedent("""\
                 static inline __attribute__((always_inline)) void
                 %s_pack(__attribute__((unused)) global void * restrict dst,
-                      %s__attribute__((unused)) const struct %s * restrict values)
+                      %s__attribute__((unused)) private const struct %s * restrict values)
                 {""") % (name, ' ' * len(name), name))
             else:
                 print(textwrap.dedent("""\