[X86][SSE] LowerUINT_TO_FP_i64 - only use HADDPD for size/fast-hops
We were always generating a single source HADDPD, but really we should only do this if shouldUseHorizontalOp says its a good idea. Differential Revision: https://reviews.llvm.org/D69175 llvm-svn: 375341
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