function computeFloat16OffsetTable() {
    const offsetTable = new Uint32Array(64);
    for(let i = 0; i < 64; i++)offsetTable[i] = 1024;
    offsetTable[0] = offsetTable[32] = 0;
    return offsetTable;
}
Computes offset table for casting Float16 to Float32
See http://www.fox-toolkit.org/ftp/fasthalffloatconversion.pdf

@returns Uint32Array, 6d offset values.