aco: fix incorrect assertion in emit_vop3a_instruction()

Fixes some float controls tests on Polaris10.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Fixes: 0b6448bbe791474a152d53bfaf750408807ac166
   ('aco/isel: refactor emit_vop3a_instruction() to handle 2 operand instructions')

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6744>
1 file changed