[m-rev.] for review: add builtin 64-bit integer types -- part 2

[Zoltan Somogyi]

Attached is my review of the changes to the compiler;
I will look at the changes to the library tomorrow.

I see that the largest part of the diff is the test cases,
including .exp files. I don't think any human can really
check these without dying of boredom.

Each line of the output now gives the result of a Mercury
operation on 64 bit ints/uints. How hard would it be to
follow every line with the result of the same operation,
but executed in C? Then all we would have to do is to check
that every such line pair is identical, a task that is trivial
to automate.

Zoltan.
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