[pallas] Support DMA start partial discharge and run_scoped() does its own partial discharge. #25775
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[pallas] Support DMA start partial discharge and run_scoped() does its own partial discharge.
This CL lays the ground for a future CL that makes run_scoped discharge to not request the discharge of the temporary buffers it creates. This causes issues becausa
a) dma_start can't discharge some but not all its references
b) run_scoped() lowering depends on run_scoped discharge to remove the run_scoped operation (or it goes in an infinite loop).