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Conflicts:
	tests/perf/compiler/all.T

Rule dump output now goes to stdout.

Looking at the ticky output before and after the FastString patches,
the extra allocation seems to be in pprName, and looking at the core
it looks like it's just caused by small differences in what does and
doesn't get inlined.

The actual size of the change is small: from 578940312 to 589671096.

We've been getting steadily worse on this test, this time we were
hovering on the borderline and failing sometimes so I've updated the
value.  It is a bit worrying though.

Now it breaks properly again.

Conflicts:
	tests/typecheck/should_fail/tcfail181.stderr

Remove exact base 2 logarithms, since their values depend on whether
excess precision is used or not (see also #5165).

Also make T5975b actually load the file, it looks like this was an
oversight when the test was created (it wasn't doing anything useful
at all).