nir: Remove reg_intrinsics parameter to convert_from_ssa

All users must set it.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24450>

src/compiler/nir/nir.h

@@ -5992,12 +5992,10 @@ nir_rewrite_uses_to_load_reg(struct nir_builder *b, nir_ssa_def *old,
 
 /* If phi_webs_only is true, only convert SSA values involved in phi nodes to
  * registers.  If false, convert all values (even those not involved in a phi
- * node) to registers.  If reg_intrinsics is true, it will use
- * decl/load/store_reg intrinsics instead of nir_register.
+ * node) to registers.
  */
 bool nir_convert_from_ssa(nir_shader *shader,
-                          bool phi_webs_only,
-                          bool reg_intrinsics);
+                          bool phi_webs_only);
 
 bool nir_lower_phis_to_regs_block(nir_block *block);
 bool nir_lower_ssa_defs_to_regs_block(nir_block *block);