internal/trace: clarify which StateTransition events have stacks
Clarify that EvGoDestroy, EvGoSyscallEnd and EvGoSyscallEndBlocked do
not have a stack trace by removing the code that tries to assign an
empty stack.
Change-Id: I6a6a696479ac7f753b3c6f6f48d8b9b67f6e3b95
Reviewed-on: https://go-review.googlesource.com/c/go/+/694621 Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>