Don't split an IB at the end of ring buffer.
Splitting an IB at the end of ring can hang the GPU. To fix this, if
there isn't enough contiguous space at the end to fit the full IB,
insert NOPs at the end, and write the IB at the start as space
becomes available.
Change-Id: Ie7e68cf449b14823cfd3e0409907a98c24354227
Signed-off-by:
Aravind Ganesan <aravindg@codeaurora.org>
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