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Up to [DVB] / dietlibc / x86_64

  plumbing to get preliminary PIE support for x86_64

.text
.global __CAS
#ifdef __PIE__
.hidden __CAS
#endif
.type __CAS,@function
__CAS:
	movq %rsi, %rax
	lock cmpxchgq %rdx, (%rdi)
	ret
.size __CAS, .-__CAS