Daniel McIntosh f011a53c14 [libcxxabi] Added convenience classes to cxa_guard
This is the 5th of 5 changes to overhaul cxa_guard.
See D108343 for what the final result will be.

Depends on D115368

Reviewed By: ldionne, #libc_abi

Differential Revision: https://reviews.llvm.org/D115369
2022-01-12 17:31:36 -05:00
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