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in libc++, on __ARM_ARCH < 6. Additionally, supply the missing stub __libcpp_relaxed_store(), as proposed in http://reviews.llvm.org/D13051 NOTE: this needs to be fixed properly later on, by supplying library functions implementing atomic operations for arm < v6. We should probably take those from sys/arm/arm/stdatomic.c, and stuff them into either libgcc or compiler-rt.