nir: Make nir_ssa_def_rewrite_uses_after take an SSA value

This replaces the new_src parameter of nir_ssa_def_rewrite_uses_after()
with an SSA def, and rewrites all the users as needed.

Acked-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9383>

src/compiler/glsl/gl_nir_lower_buffers.c

@@ -247,7 +247,7 @@ lower_buffer_interface_derefs_impl(nir_function_impl *impl,
                   intrin->dest.ssa.bit_size = 32;
                   nir_ssa_def *bval = nir_i2b(&b, &intrin->dest.ssa);
                   nir_ssa_def_rewrite_uses_after(&intrin->dest.ssa,
-                                                 nir_src_for_ssa(bval),
+                                                 bval,
                                                  bval->parent_instr);
                   progress = true;
                }