anv/query: handle out of host memory without crashing in compute_query_result()

anv/query: handle out of host memory without crashing in compute_query_result()

We don't need to make the caller (CmdCopyQueryPoolResults) aware of the
problem since compute_query_result() only emits state. The caller is also
expected to hit OOM in this scenario right after calling this function, but
it is already handling it safely.

Fixes:
dEQP-VK.api.out_of_host_memory.cmd_copy_query_pool_results

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>