i#5036 A64 scatter/gather, part 10: Non-fault loads

[jackgallagher-arm]

Adds support for non-fault loads to drx_expand_scatter_gather(). Non-fault loads (ldnf1*) work similarly to scalar+immediate predicated contiguous ld1* loads, but with different behaviour if an element access faults. This commit implements this behaviour and extends the scatter/gather tests to include ldnf1* instructions.

Issue: #5036

[jackgallagher-arm]

client.detach_test is timing out repeatedly on the vs2019-32 build. I can't see anything in this patch which would affect that test so I suspect the failure is spurious.

201/262 Test #131: code_api|client.detach_test ..................................***Timeout  90.02 sec

[derekbruening]

client.detach_test is timing out repeatedly on the vs2019-32 build. I can't see anything in this patch which would affect that test so I suspect the failure is spurious.

201/262 Test #131: code_api|client.detach_test ..................................***Timeout  90.02 sec

As with any test failure, please file a bug and cite it here or cite an existing bug if one is already filed.