[AMDGPU] Schedule independent instructions between s_barrier_signal and s_barrier_wait (#172057) On gfx12+, the unified` s_barrier` is lowered to split `s_barrier_signal/s_barrier_wait` pairs. By default, the dependency edge between signal and wait has zero latency, causing the scheduler to emit them adjacent to each other. This misses the opportunity to hide barrier latency. This patch adds synthetic latency to the signal-wait barrier edge to encourage latency hiding. Independent instructions are scheduled in the gap between split barrier signal and wait. The latency is tunable via -amdgpu-barrier-signal-wait-latency. Fixes: SWDEV-567090
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