Generated from x/text.

Significant changes in the interpretation
of the Bidi rule as well as sharpening of
the leading dot rules, among other things.

Issue golang/go#21471

Change-Id: I8649a4090e2bc530aad4412210a3de344fb2eab6
Reviewed-on: https://go-review.googlesource.com/63951
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>