lima/ppir: fix src read mask swizzling
The src mask can't be calculated from the dest write_mask.
Instead, it must be calculated from the swizzled operators of the src.
Otherwise, liveness calculation may report incorrect live components for
non-ssa registers.
Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3502>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3502>
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