R600/SI: Lower i64 SELECT by bitcasting to a vector type
This allows allows us to replace ISD::EXTRACT_ELEMENT, which is lowered using shifts, with ISD::EXTRACT_VECTOR_ELT, which is a no-op. llvm-svn: 205187
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This allows allows us to replace ISD::EXTRACT_ELEMENT, which is lowered using shifts, with ISD::EXTRACT_VECTOR_ELT, which is a no-op. llvm-svn: 205187