cmd/compile: refactor out an almost-superfluous arg

Moved all "target" information into "storeRC"; it was a register
cursor, now it is a register cursor that also carries the store
target with it if there are no registers.  Also allows booby-trapping
to ensure that the target is unambiguously one or the other.

For #40724.

Change-Id: I53ba4b91679e5fcc89c63b7d31225135299c6ec6
Reviewed-on: https://go-review.googlesource.com/c/go/+/293397
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
1 file changed
tree: 8b9f72734d91157f6e477d07d528652541270485
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. favicon.ico
  15. LICENSE
  16. PATENTS
  17. README.md
  18. robots.txt
  19. SECURITY.md
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