runtime: fix use of wrong g in gentraceback gentraceback gets the currently running g to do some sanity checks, but should use gp everywhere to do its actual work. Some noncritical checks later accidentally used g instead of gp. This seems like it could be a problem in many different contexts, but I noticed in Windows profiling, where profilem calls gentraceback on a goroutine from a different thread. Change-Id: I3da27a43e833b257f6411ee6893bdece45a9323f Reviewed-on: https://go-review.googlesource.com/128895 Run-TryBot: Heschi Kreinick <heschi@google.com> Reviewed-by: Austin Clements <austin@google.com>
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