[CostModel][X86] Adjust fptosi/fptoui SSE/AVX legalized costs based on llvm-mca reports.
Update (mainly) vXf32/vXf64 -> vXi8/vXi16 fptosi/fptoui costs based on the worst case costs from the script in D103695. Move to using legalized types wherever possible, which allows us to prune the cost tables.
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