v3dv: handle draw after barrier

v3dv: handle draw after barrier

Currently, we end the current job whenever the user emits a
pipeline barrier, but we then expect to have a valid job when
we emit a draw call.

If by the time we have to emit a draw call we don't have a valid
job, we need to create one by resuming execution of the current
subpass.

Fixes some tests in:
dEQP-VK.renderpass.suballocation.attachment_allocation.input_output.*

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>