[PATCH] D53802: [XRay] Use more portable control block

[Dean Michael Berris via Phabricator via llvm-commits]

dberris created this revision.
dberris added reviewers: mboerger, eizan.
Herald added a subscriber: jfb.

In https://reviews.llvm.org/D53560, we assumed a specific layout for memory without using an
explicit structure. This follow-up change uses more portable layout
control by using unions in a struct, and consolidating the memory
management code in the buffer queue.

We also take the opportunity to improve the documentation on the types
and operations, along with simplifying some of the logic in the buffer
queue implementation.


https://reviews.llvm.org/D53802

Files:
  compiler-rt/lib/xray/tests/unit/buffer_queue_test.cc
  compiler-rt/lib/xray/xray_buffer_queue.cc
  compiler-rt/lib/xray/xray_buffer_queue.h

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