AArch64: fix fmlsl and fmlal float arithmetic #6441
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As part of a research project testing the accuracy of the sleigh specifications compared to real hardware, we observed an unexpected behaviour in the fmlsl, fmlal, fmlsl2 and fmlal2 instructions for AARCH64. While the arithmetic performed on floating point values is intended to be treated as floats, the current behaviour instead uses integer addition/subtraction operations.