bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?

[Mattias Engdegård]

Andrea, I see nothing directly wrong with your patch, but perhaps our messages 
went past one another since our lists of proposed pure functions differ.

> More useful would be the ability to constant-fold ash, expt, %, mod and abs 
> for a subset of each respective domain. I can write a patch.

Here is that patch.

0001-Constant-fold-mod-ash-expt-and-abs-with-constant-int.patch
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