Anticipate testcase problems with GCC 12

Anticipate testcase problems with GCC 12

There will be a lot more to come.

On amd64 Linux
In faultstatus was seeing the division by zero and emitting a ud2 opcode.
In wrap3 a pair of mutually recursive functions were being inlined.
When forced not to be inlined GCC merged them into a single function.
It cannot see that the client requests have diffeent behaviour.