Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging

Pull request

v2:
 * Rebased after meson and resolved conflict in "softmmu: Add missing trace-events file"
 * Dropped "meson: Don't make object files for dtrace on macOS" (already merged via Paolo's tree)

# gpg: Signature made Thu 10 Sep 2020 09:09:47 BST
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/tracing-pull-request:
  trace-events: Fix attribution of trace points to source
  trace-events: Delete unused trace points
  scripts/cleanup-trace-events: Emit files in alphabetical order
  scripts/cleanup-trace-events: Fix for vcpu property
  net/colo: Match is-enabled probe to tracepoint
  scripts/tracetool: Use void pointer for vcpu
  scripts/tracetool: Fix dtrace generation for macOS
  softmmu: Add missing trace-events file

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>