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digitalmars.D - Watermark-based regression buster

With https://github.com/dlang/phobos/pull/4826 I've added a small 
improvement to sort() and also a simple watermark-based way to avoid 
performance regressions: count the number of comparisons done on some 
predefined data patterns and make sure it stays at a specific watermark.

Whenever new changes are made, an assertion fails that either prompts 
the user to update the watermark (yay) or verify why the number of 
comparisons has increased. (There may be legitimate reasons for that.)

Currently we don't count swaps, but we should. Does anyone want to take 
up on that?

Sep 30 2016