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9da0585852
Reinstate HAVE_64B_ATOMICS configure check that was reverted by commit7fec8a5de6due to BZ #33632. This was fixed by3dd2cbfa35by only allowing 64-bit atomics on sem_t if its type is 8-byte aligned. Rebase and add in cleanups in include/atomic.h that were omitted. Fix an issue with sparcv8-linux-gnu-leon3 forcing -mcpu=v8 for rtld.c which overrules -mcpu=leon3 and causes __atomic_always_lock_free (4, 0) to incorrectly return 0 and trigger asserts in atomics. Remove this as it seems to be a workaround for an issue in 1997. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>