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ir3: Be able to reduce register limit for RA when CS has barriers

Danylo Piliaiev requested to merge Danil/mesa:fix/ir3/regs-limit-in-cs-with-barrier into main

If barriers are used, it must be possible for all waves in the workgroup to execute concurrently. Thus we may have to reduce the registers limit.

Fixes a hang in "Digital Combat Simulator".

After this the trace of this game renders correctly, but only if ubwc is disabled.

While I'm at it - I added an assert for the case when it would be impossible to have enough concurrent waves due to a big branchstack.

Last time I checked the blob exploded in such case: !9859 (comment 871421)

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