Write export labels into replay functions. This will allow them to be recaptured in such a way that they can be built into separate modules. This is building towards separate binaries for each trace. Bug: angleproject:5133 Change-Id: I306204e69a6d754282193f44055dbc85ccb01e9b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2506491 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>