[X86] Fix arithmetic error in extractVector (#128052) The computation of the element count for the result VT in extractVector is incorrect when vector width does not divide VT.getSizeInBits(), which can occur when the source vector element count is not a power of two, e.g. extracting a vectorWidth 256b vector from a 384b source. This rewrites the expression so the division is exact given that vectorWidth is a multiple of the source element size.
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