Stuart Brady e121b9d1bf Fix sub_group_ballot_find_msb/lsb tests (#1411) ...

As per the OpenCL Extension Specification § 38.6 Ballots:

   If no bits representing predicate values from all work items in
   the subgroup are set in the bitfield value then the return value
   is undefined.

The case with no bits set is still worth testing, as it does not result
in undefined behavior, but only an undefined return value.

Signed-off-by: Stuart Brady <stuart.brady@arm.com>

2022-04-04 09:57:36 -07:00

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