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[libc++] Refactoring __sync_* builtins; NFC

Description

[libc++] Refactoring __sync_* builtins; NFC

Summary: Wrap sync_* builtins with libcpp_ functions to facility future customizations as atomic operations are unavailable on some targets.

Reviewers: danalbert, EricWF, jroelofs

Subscribers: joerg, llvm-commits

Differential Revision: https://reviews.llvm.org/D34918

Details

Committed
weimingzJul 10 2017, 2:02 PM
Differential Revision
D34918: [libc++] Refactoring __sync_* builtins; NFC
Parents
rL307590: [lld/pdb] Add some basic linker module symbols.
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