[compiler-rt] Implement __atomic_is_lock_free
This function is called by the __atomic_is_lock_free() builtin if the value
cannot be resolved to true at compile time. Lack of this function is
causing the non-lockfree atomics tests in libc++ to not be run (see D91911)
This function is also added in D85044, but that review also adds support
for using lock-free atomics in more cases, whereas this is a minimal change
that just adds __atomic_is_lock_free() for the implementation of atomic.c.
Reviewed By: ldionne
Differential Revision: https://reviews.llvm.org/D92302
GitOrigin-RevId: 00530dee5d1295dc20ebafdd9a8a79662f41513e
2 files changed
