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This commit does the following to get tests passing for MSVC/AArch64: * Implements spin_delay() with an ISB instruction (like we do for gcc/clang on AArch64). * Sets USE_ARMV8_CRC32C unconditionally. Vendor-supported versions of Windows for AArch64 require at least ARMv8.1, which is where CRC extension support became mandatory. * Implements S_UNLOCK() with _InterlockedExchange(). The existing implementation for MSVC uses _ReadWriteBarrier() (a compiler barrier), which is insufficient for this purpose on non-TSO architectures. There are likely other changes required to take full advantage of the hardware (e.g., atomics/arch-arm.h, simd.h, pg_popcount_aarch64.c), but those can be dealt with later. Author: Niyas Sait <niyas.sait@linaro.org> Co-authored-by: Greg Burd <greg@burd.me> Co-authored-by: Dave Cramer <davecramer@gmail.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: John Naylor <johncnaylorls@gmail.com> Reviewed-by: Peter Eisentraut <peter@eisentraut.org> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Thomas Munro <thomas.munro@gmail.com> Tested-by: Andrew Dunstan <andrew@dunslane.net> Discussion: https://postgr.es/m/A6152C7C-F5E3-4958-8F8E-7692D259FF2F%40greg.burd.me Discussion: https://postgr.es/m/CAFPTBD-74%2BAEuN9n7caJ0YUnW5A0r-KBX8rYoEJWqFPgLKpzdg%40mail.gmail.com