Support i8 -> i16 -> i32 extension in new SIMD API #625
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This will replace uses of `load_extend_i8` in the old API. The new APIs are more efficient as they always expand one whole vec to two (1x 8-bit -> 2x 16-bit -> 4x 32-bit) whereas the previous API expanded 1/4 of an 8-bit vec to 1x 32-bit.
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This will replace uses of
load_extend_i8in the old API. The new APIs are more efficient as they always expand one whole vec to two (1x 8-bit -> 2x 16-bit -> 4x 32-bit) whereas the previous API expanded 1/4 of an 8-bit vec to 1x 32-bit.