Slight perf improvement on char::to_ascii_lowercase#81837

Merged

bors merged 5 commits intorust-lang:masterfrom gilescope:to_ascii_speedups

Feb 23, 2021

+35-6

Commits on Feb 6, 2021

Commits on Feb 8, 2021

Unify way to flip 6th bit. (Same assembly generated)
gilescope
committed

Commits on Feb 12, 2021

Slightly more explicit
gilescope
committed

Commits on Feb 14, 2021

Move const def nearer usage.
gilescope
committed