ir3: correctly set wrmask for reload.macro

We used to set it MASK(elems) which would break when not all elements
are contiguous (which could happen for tex instructions after dce).

Fixes: 613eaac7b5 ("ir3: Initial support for spilling non-shared registers")
Signed-off-by: Job Noorman <jnoorman@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29497>

src/freedreno/ir3/ir3_spill.c

@@ -939,7 +939,7 @@ reload(struct ra_spill_ctx *ctx, struct ir3_register *reg,
       dst->array.id = reg->array.id;
       dst->size = reg->size;
    } else {
-      dst->wrmask = MASK(elems);
+      dst->wrmask = reg->wrmask;
    }
 
    dst->merge_set = reg->merge_set;