nir/print: Don't reindex things
nir/print: Don't reindex things

These indices should now be reasonably stable/consistent.  Redoing the
indices in the print functions makes it harder to debug problems.

Reviewed-by: Connor Abbott <71178acffcc112b21e5858656e5751f5e4aa9364@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler