UnVectorised instructions are required to be detected as such if Prefixed
(either SVP64 or SVP64Single) and an Illegal Instruction Trap raised.
-*Architectural Note: Given that a "pre-classification" Decode Phase
+*Hardware Architectural Note: Given that a "pre-classification" Decode Phase
is required (identifying whether the Suffix - Defined Word - is
Arithmetic/Logical, CR-op, Load/Store or Branch-Conditional), adding
"UnVectorised" to this phase is not unreasonable.*