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Shenghou Ma authored
This is a follow-up to CL 5978051. Use kernel cas64 helper if we can, fallback to LDREXD/STREXD if we are on ARMv6 or higher, and to lock-emulated cas64 if on ARMv5. A future CL will fix {Add,Load,Store}{Int,Uint}64 and issue 3331. R=bradfitz, rsc CC=golang-dev https://golang.org/cl/60340484d724f4c
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