cmd/compile: delete isPowerOfTwo, switch to isPowerOfTwo64

rewrite.go has two identical functions isPowerOfTwo and
isPowerOfTwo64; the former has been there for a while, while the
latter was added together with isPowerOfTwo{8,16,32} for use in typed
rules.

This change deletes isPowerOfTwo and switch to using isPowerOfTwo64
everywhere.

Change-Id: If26c94565d2393fac6f0ba117ee7ee2fc915f7cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/265417
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
9 files changed
tree: 4700abc98004078dcd8ca4abf9fae76af63d7a97
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
README.md

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