runtime: refactor defer processing This CL refactors gopanic, Goexit, and deferreturn to share a common state machine for processing pending defers. The new state machine removes a lot of redundant code and does overall less work. It should also make it easier to implement further optimizations (e.g., TODOs added in this CL). Change-Id: I71d3cc8878a6f951d8633505424a191536c8e6b3 Reviewed-on: https://go-review.googlesource.com/c/go/+/513837 Reviewed-by: Keith Randall <khr@golang.org> Run-TryBot: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Keith Randall <khr@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
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