[XRay][tools] Support tail-call exits before we write them in the runtime
Summary:
This change adds support for explicit tail-exit records to be written by
the XRay runtime. This lets us differentiate the tail exit
records/events in the log, and allows us to treat those exit events
especially in the future. For now we allow printing those out in YAML
(and reading them in).
Reviewers: kpw, pelikan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D37964
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313514
91177308-0d34-0410-b5e6-
96231b3b80d8
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