diff: tabling code (compiler only)

[Fergus Henderson]

Oliver Hutchison <ohutch at students.cs.mu.OZ.AU> writes:

>Added code to handle tabling pragmas and to generate tabling code for the
>memo and loop_check cases. 
>The changes to the runtime are not included in this diff.

Sorry, forgot to include a final summary in my previous mail:
could you please address the issues raised and then post another diff.

Also, could you please add some documentation for this stuff to
doc/reference_manual.texi, in the "implementation dependent
pragmas" section?

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