nir/lower_shader_calls: adding missing stack offset alignment
Signed-off-by:Lionel Landwerlin <lionel.g.landwerlin@intel.com> Fixes: 8dfb240b ("nir: Add raytracing shader call lowering pass.") Reviewed-by:
Jason Ekstrand <jason@jlekstrand.net> Part-of: <mesa/mesa!12112> (cherry picked from commit 7e3bad0f)