Enable crc instructions when building for arm64 cpu (iOS) #1154
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I am not sure if this is the correct way to fix the compilation issue #1074, but this works for me.
CRC instructions are enabled by default on ARMv8, but I don't know why it doesn't work when building for arm64, so I have added
mcrc
toIOS_CXXFLAGS
if the CPU is arm64https://clang.llvm.org/docs/UsersManual.html