nvc0/ir: Initialize CodeEmitterNVC0 member progType in constructor.

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.

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Part-of: <!11350>
32 jobs for !11350 with fix-cid-742278 in 9 minutes and 19 seconds (queued for 2 seconds)
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