runtime: replace sched.mcount int32 with sched.mnext int64
Currently, since Ms never exit, the number of Ms, the number of Ms ever created, and the ID of the next M are all the same and must be small. That's about to change, so rename sched.mcount to sched.mnext to make it clear it's the number of Ms ever created (and the ID of the next M), change its type to int64, and use mcount() for the number of Ms. In the next commit, mcount() will become slightly less trivial. For #20395. Change-Id: I9af34d36bd72416b5656555d16e8085076f1b196 Reviewed-on: https://go-review.googlesource.com/68750 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Keith Randall <khr@golang.org>
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