Tune DTrace 'aframes' for the FBT and profile providers on arm64.

[rwatson]

Summary

In both cases, too few frames were trimmed, leading to exception handling
or DTrace internals being exposed in stack traces exposed by D's stack()
primitive.

MFC after: 3 days

[emaste]

sys/cddl/dev/profile/profile.c

107

I deleted this and the sparc comment above in 64a790d264808116469914c19265e905b3929e00, thinking that this change had already been committed. In any case this shouldn't be a conflict.

[andrew]

sys/cddl/dev/profile/profile.c

117

There is also a duplicate __mips that could be removed after this has been committed

133

Here