nv50/ir: Initialize CodeEmitterNV50 member progType.

nv50/ir: Initialize CodeEmitterNV50 member progType.

Make progType a constructor argument.

Fix defect reported by Coverity Scan.

Uninitialized scalar field (UNINIT_CTOR)
uninit_member: Non-static class member progType is not initialized
in this constructor nor in any functions that it calls.

Suggested-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10562>