internal/runtime/maps: document hashing of stack pointers

CL 776281 makes it a bit clearer that we're doing pointer to uintptr
conversion on pointer keys. That sent me down something of a rabbit
hole trying to figure out how that actually could work, given stack
copies could happen after hashing but before the core map operation.
Turns out it does work, for subtle reasons. Documenting here.

Change-Id: I49158c44254f57ca56c7e1ec23c337d80e46ed6a
Reviewed-on: https://go-review.googlesource.com/c/go/+/779240
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Arseny Samoylov <samoylov.arseny@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Keith Randall <khr@google.com>
4 files changed
tree: a338ad08b4517325e8f06ae9b24b7aa4d1a8dc10
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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