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aco: calculate correct register demand for branch instructions

Rhys Perry requested to merge pendingchaos/mesa:aco_spill_live_in_br_def_exec into main

The previous code wasn't correct if the block had phis with exec or constant operands (causing the register demand after the block's phis to not match the size of the predecessors's live-out).

Fixes a Detroit: Become Human spilling failure with GCM+GVN.

Edited by Rhys Perry

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