runtime: make traceback indicate whether _defer was just allocated Many of the crashes observed in #27993 involve committing the new _defer object at the end of newdefer. It would be helpful to know if the _defer was just allocated or was retrieved from the defer pool. In order to indicate this in the traceback, this CL duplicates the tail of newdefer so that the PC/line number will tell us whether d is new or not. For #27993. Change-Id: Icd3e23dbcf00461877bb082b6f18df701149a607 Reviewed-on: https://go-review.googlesource.com/c/154598 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com>
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