runtime: fix heap pointer invariant rules in HACKING.md
This change fixes an error in HACKING.md which claims all pointers which live in unmanaged memory but point to the heap must be marked as GC roots explicitly by runtime.markroot. This isn't technically necessary if the pointer is accessible through a global variable. Change-Id: I632b25272fdb2f789c5259dd1685d517f45fd435 Reviewed-on: https://go-review.googlesource.com/c/151539Reviewed-by:Rick Hudson <rlh@golang.org>
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