Add fallback SIMD implementation #1342
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This will be used on platforms that don't have native SIMD support.
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Currently, on platforms that don't have an implementation of
SIMDNativeOps,SIMDRegisteris not available.This PR makes functionality gracefully degrade by adding a fallback implementation of
SIMDNativeOpsthat simply calls the fallback functions that already exist inSIMDFallbackOps.On platforms that already support SIMD, nothing changes, but other platforms will now have implementations of
SIMDRegisterthat use the fallback functions, so software that usesSIMDRegisterwill automatically support more platforms without any additional effort.All unit tests pass on
x86_64,aarch64, andppc64le.