treewide: use nir_def_replace sometimes

Two Coccinelle patches here. Didn't catch nearly as much as I would've liked but
it's a start.

Coccinelle patch:

    @@
    expression intr, repl;
    @@

    -nir_def_rewrite_uses(&intr->def, repl);
    -nir_instr_remove(&intr->instr);
    +nir_def_replace(&intr->def, repl);

Coccinelle patch:

    @@
    identifier intr;
    expression instr, repl;
    @@

    nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
    ...
    -nir_def_rewrite_uses(&intr->def, repl);
    -nir_instr_remove(instr);
    +nir_def_replace(&intr->def, repl);

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Juan A. Suarez Romero <jasuarez@igalia.com> [broadcom]
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com> [lima]
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com> [etna]
Reviewed-by: Pavel Ondračka <pavel.ondracka@gmail.com> [r300]
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29817>

src/compiler/nir/nir_lower_io.c

@@ -2276,8 +2276,7 @@ lower_explicit_io_array_length(nir_builder *b, nir_intrinsic_instr *intrin,
    nir_def *remaining = nir_usub_sat(b, size, offset);
    nir_def *arr_size = nir_udiv_imm(b, remaining, stride);
 
-   nir_def_rewrite_uses(&intrin->def, arr_size);
-   nir_instr_remove(&intrin->instr);
+   nir_def_replace(&intrin->def, arr_size);
 }
 
 static void
@@ -3115,8 +3114,7 @@ nir_lower_color_inputs(nir_shader *nir)
             load = nir_channels(&b, load, BITFIELD_RANGE(start, count));
          }
 
-         nir_def_rewrite_uses(&intrin->def, load);
-         nir_instr_remove(instr);
+         nir_def_replace(&intrin->def, load);
          progress = true;
       }
    }