Re: [PATCH v2 0/2] MR208: vkd3d-shader/hlsl: Fix liveness of temps within loops.

[Giovanni Mascellani (＠giomasce)]

Giovanni Mascellani (@giomasce) commented about libs/vkd3d-shader/hlsl_codegen.c:
> var = store->lhs.var;
>              if (!var->first_write)
>                  var->first_write = loop_first ? min(instr->index, loop_first) : instr->index;
> -            store->rhs.node->last_read = instr->index;
> +            store->rhs.node->last_read = last_read;
>              if (store->lhs.offset.node)

Again not onto this MR, but maybe we could assert here that the path in all `hlsl_deref`'s is null, mostly as a justification to the reader possibly questioning why we're not extending the `last_read` there too.

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/208#note_32992