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[llvm] Check availability for os_signpost

Authored by JDevlieghere on Feb 24 2021, 4:23 PM.

Description

[llvm] Check availability for os_signpost

Add availability checks to the os_signpost code so this can be used with
an older deployment target.

Differential revision: https://reviews.llvm.org/D97410

Details

Committed
JDevlieghereFeb 24 2021, 4:27 PM
Differential Revision
D97410: [llvm] Check availability for os_signpost
Parents
rG7c926fee9300: Improve attribute documentation for nodebug on typedefs
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