Implement SIMD swizzle #1248
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Implement SIMD swizzle #1248
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This implements the SIMD swizzle instruction using the
PADDUSB 0x70 mask + PSHUFBcode sequence proposed by @zeux. This implementation has an extra instruction toMOVthe mask into a register but this could be removed by a future optimization adding additional addressing modes to arithmetic instructions (in this caseuadd_sat).This PR depends on #1246 being merged[edit: this is now merged]