b1f8e15781
Also ensure that 'needs_scratch_reg' is always true if SCC might be overwritten.
Few changes, because some p_split_vector get SCC as scratch reg assigned,
and thus, can inhibit some postRA optimizations.
Totals from 3 (0.00% of 79395) affected shaders: (Navi31)
Instrs: 10501 -> 10500 (-0.01%); split: -0.02%, +0.01%
CodeSize: 51580 -> 51520 (-0.12%); split: -0.12%, +0.01%
Latency: 84166 -> 84174 (+0.01%)
InvThroughput: 13109 -> 13111 (+0.02%)
SALU: 859 -> 860 (+0.12%)
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32217>
(cherry picked from commit a04e096339)
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