Revert "anv/radv: release memory allocated by glsl types during spirv_to_nir"

This reverts commit 4e1bbb00.  It turns
out that some DXVK apps due to some implementation detail of DXVK or
other create and destroy instances in an interleaved way.  Freeing the
glsl_type memory without being a bit more careful causes use-after-free
issues.  Looks like we need to try again.

(cherry picked from commit ce47999c)