[X86][SSE][CostModel] Added full set of sitofp/uitofp costings for SSE2/AVX/AVX2/AVX512F.
Merged separate (but equivalent) SSE2/AVX512F tests. Removed codegen tests since these are already done better in test/CodeGen/X86. The actual cost values still need to be updated to match recent codegen improvements. llvm-svn: 240219
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