Craig Topper 57c0c4a275 [X86] Fix crash with i64 bitreverse on 32-bit targets with XOP. ...

We unconditionally marked i64 as Custom, but did not install a
handler in ReplaceNodeResults when i64 isn't legal type. This
leads to ReplaceNodeResults asserting.

We have two options to fix this. Only mark i64 as Custom on
64-bit targets and let it expand to two i32 bitreverses which
each need a VPPERM. Or the other option is to add the Custom
handling to ReplaceNodeResults. This is what I went with.

2020-11-15 19:02:34 -08:00

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