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9e9d1f4398
This is the second iteration of the backends, which were both tested on a QEMU VM and did not show any test failures. The essential difference from the first version is that in AArch64 we now initialize the success flag in the asm blocks in compare_exchange operations rather than relying on compiler initializing it before passing into the asm block as an in-out parameter. Apparently, this sometimes didn't work for some reason, which made compare_exchange_strong return incorrect value, which broke futex-based mutexes in the lock pool. The above change was also applied to AArch32, along with minor corrections in the asm blocks constraints.