runtime: make PCDATA_RegMapUnsafe more clear and remove magic number

Change-Id: Ibf3ee755c3fbec03a9396840dc92ce148c49d9f7
GitHub-Last-Rev: 945d8aaa136003dc381c6aa48bff9ea7ca2c6991
GitHub-Pull-Request: golang/go#41262
Reviewed-on: https://go-review.googlesource.com/c/go/+/253377
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
4 files changed
tree: 6daab5ba52b4a5fa82f75c0eb3674a6f3ec8389d
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
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