nir: Drop unused name from nir_ssa_dest_init
Since 624e799c ("nir: Drop nir_ssa_def::name and nir_register::name"), SSA defs don't have names, making the name argument unused. Drop it from the signature and fix the call sites.
[Note for review: most call sites fixed in next patch.]
Signed-off-by: Alyssa Rosenzweig alyssa@rosenzweig.io