Old style vector function defines on all platforms
Begun cross platform gcc/clang vector implementation
Added cross platform gcc/clang vector U32/U64 support
Split off scalar u32/u64 crash functions to fix gcc arm neon build
Added libdivide_*_t type defs to all vector types
Converted test to cross-platform
Completed initial support for cross platform gcc/clang vectors
Cross platform benchmarks
Added fast horizontal sum operation to benchmark
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