nir/glsl: switch to using the builder
nir/glsl: switch to using the builder

v2: use nir_bulder_cf_insert (Ken)

Signed-off-by: Connor Abbott <71178acffcc112b21e5858656e5751f5e4aa9364@gmail.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler