regexp: use slices to simplify the code
Replace some "reflect.DeepEqual" calls in the tests with
"slices.Equal" which is much faster for slice comparisons.
Remove unnecessary "runeSlice" and redundant helper functions.
Change-Id: Ib5dc41848d7a3c5149f41701d60471a487cff476
GitHub-Last-Rev:
87b5ed043d2935b971aa676cc52b9b2c5b45736b
GitHub-Pull-Request: golang/go#66509
Reviewed-on: https://go-review.googlesource.com/c/go/+/573977
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>