Clean up and move some copy-pasted items into a new mseal_helpers.h.
1. The test macros can be made safer and simpler, by observing that they
are invariably called when about to return. This means that the macros
do not need an intrusive label to goto; they can simply return.
2. PKEY* items. We cannot, unfortunately use pkey-helpers.h. The best we
can do is to factor out these few items into mseal_helpers.h.
3. These tests still need their own definition of u64, so also move that
to the header file.
Cc: Jeff Xu <jeffxu@xxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
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