We can't insert mul node into add node instruction if it's a virtual dep
(sequence or write_or_read dep), so use ppir_node_has_single_src_succ
in addition to ppir_node_has_single_succ.
We can't use ppir_node_has_single_src_succ alone, since node may have
a virtual dependency in addition to source dependency, and we can't
insert it either in this case.
Reviewed-by: Andreas Baierl <ichgeh@imkreisrum.de>
Reviewed-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13830>
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