[llvm-bugs] [Bug 51129] New: [DAG] Add llvm::isGuaranteedNotToBePoison(SDValue) helper method

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https://bugs.llvm.org/show_bug.cgi?id=51129

            Bug ID: 51129
           Summary: [DAG] Add llvm::isGuaranteedNotToBePoison(SDValue)
                    helper method
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: craig.topper at gmail.com, efriedma at quicinc.com,
                    juneyoung.lee at sf.snu.ac.kr, lebedev.ri at gmail.com,
                    llvm-bugs at lists.llvm.org, nikita.ppv at gmail.com,
                    nunoplopes at sapo.pt, spatel+llvm at rotateright.com

As suggested on D106053, we're going to need some way to confirm a source value
isn't poison.

We might need this at the per-element level for vectors as well, so a
DemandedElts mask might be necessary.

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