[perl #40631] [TODO] add tests for native PMC types

[Jerry Gay]

# New Ticket Created by Jerry Gay
# Please include the string: [perl #40631]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=40631 >

the following test files, located in F<t/pmc/>, have one test each,
verifying that they can be created:

D:\usr\local\parrot\head\t\pmc>ack -l --perl "tests => 1;"
.\addrregistry.t
.\bound_nci.t
.\compiler.t
.\csub.t
.\default.t
.\deleg_pmc.t
.\enumerate.t
.\exception_handler.t
.\lexinfo.t
.\lexpad.t
.\multisub.t
.\null.t
.\parrotclass.t
.\parrotinterpreter.t
.\parrotio.t
.\parrotlibrary.t
.\parrotthread.t
.\pointer.t
.\random.t
.\retcontinuation.t
.\scalar.t
.\sharedref.t
.\super.t
.\sys.t
.\tqueue.t
.\unmanagedstruct.t
.\version.t
.\vtablecache.t

obviously, this is unsatisfactory. extensive testing is required for
each pmc type listed above.
~jerry