Eric Fiselier 7726a348df Prevent dependancy on libatomic when using GCC to provide <atomic>. ...

The __atomic_is_lock_free(...) function sometimes requires linkage to libatomic
if it cannot be evaluated at compile time. Remove __c11_atomic_is_lock_free
and use __atomic_is_lock_free(sizeof(Tp)) directly so that it can be evaluated
at compile time.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@239648 91177308-0d34-0410-b5e6-96231b3b80d8

2015-06-13 00:23:07 +00:00

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