[llvm] r327898 - [DAG, X86] Revert r327197 "Revert r327170, r327171, r327172"

[Nirav Davé via llvm-commits]

<facepalm>. I dropped a parentheses. invalidation should be bit-negation so
-(x+1) not -x+1.
I'll land a fix presently.

Also you should check out X86's / SystemZ's insertDAGNode at HEAD. I just
landed a fix regarding inserting an invalidated node that already exists in
there. You'll probably want to do the same for your target.

-Nirav
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