feat(cts): Generate both NaN modes for FP_SPECIAL
One FP_SPECIAL test is generated for each op and datatype, which means for some types only one NaN mode is tested.
- Generate tests with both PROPAGATE and IGNORE NaN modes
Signed-off-by: Madeleine Dunn madeleine.dunn@arm.com Change-Id: I123adfd9734b1254109a88454a397d231c918fdd