[m-rev.] for review: start using type_spec_constrained_preds pragmas

[Zoltan Somogyi]

There are two rotds with the commit that this diff requires.

My laptop's timings are too variable to be able to measure
the speed impact of this diff. For tools/speedtest, I got a 0.7%
speedup; for tools/bootcheck -j6, approx the same slowdown.
If someone with a less volatile machine could try it out,
I would be grateful.

For review by anyone.

Zoltan.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Log.tscpu
Type: application/octet-stream
Size: 1569 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20240209/39cbd408/attachment-0002.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: DIFF.tscpu
Type: application/octet-stream
Size: 50779 bytes
Desc: not available
URL: <http://lists.mercurylang.org/archives/reviews/attachments/20240209/39cbd408/attachment-0003.obj>