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>
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