nir: Add option lower_uniforms_to_ubo

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6316>

src/compiler/nir/nir.h

@@ -3319,6 +3319,10 @@ typedef struct nir_shader_compiler_options {
 
    unsigned max_unroll_iterations;
 
+   /* For the non-zero value of the enum corresponds multiplier when
+    * calling lower_uniforms_to_ubo */
+   bool lower_uniforms_to_ubo;
+
    nir_lower_int64_options lower_int64_options;
    nir_lower_doubles_options lower_doubles_options;
 } nir_shader_compiler_options;