compiler: Free types in _mesa_glsl_release_types() rather than autofree.

Instead of using ralloc_autofree_context() to install an atexit()
handler to ralloc_free(glsl_type::mem_ctx), we can simply free them
from _mesa_glsl_release_types().

This is effectively the same, because _mesa_glsl_release_types() is
called from _mesa_destroy_shader_compiler(), which is called from Mesa's
one_time_fini() function, which Mesa installs as an atexit() handler.

The one advantage here is that it ensures the built-in functions are
destroyed before the types.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/compiler/glsl_types.cpp

@@ -40,7 +40,7 @@ void
 glsl_type::init_ralloc_type_ctx(void)
 {
    if (glsl_type::mem_ctx == NULL) {
-      glsl_type::mem_ctx = ralloc_autofree_context();
+      glsl_type::mem_ctx = ralloc_context(NULL);
       assert(glsl_type::mem_ctx != NULL);
    }
 }
@@ -416,6 +416,9 @@ _mesa_glsl_release_types(void)
       _mesa_hash_table_destroy(glsl_type::interface_types, NULL);
       glsl_type::interface_types = NULL;
    }
+
+   ralloc_free(glsl_type::mem_ctx);
+   glsl_type::mem_ctx = NULL;
 }