[dev.regabi] cmd/compile: finish cleanup of Flag initialization

Now that all flags are in a struct, use struct tags to set the usage messages
and use reflection to walk the struct and register all the flags.

Also move some flag usage back into main.go that shouldn't
come with the rest of flag.go into package base.

Change-Id: Ie655582194906c9ab425c3d01ad8c304bc49bfe0
Reviewed-on: https://go-review.googlesource.com/c/go/+/271668
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
3 files changed
tree: b7903a1b7ec75b045662e5b9d521df505c606101
  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
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