[m-rev.] for review: centralize compiler's knowledge of __Unify__ etc names

[Zoltan Somogyi]

> I don't think there is any significant efficiency issue.

And now I know so. One of the following is an unmodified compiler; the other
has the diff applied. The difference is less than timing noise.

mercury_compile.01 average of 12 with ignore=1     30.30
mercury_compile.02 average of 12 with ignore=1     30.28

Zoltan.
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