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[Constants] Handle FNeg in getWithOperands.

Authored by fhahn on Aug 20 2020, 2:47 AM.



Currently ConstantExpr::getWithOperands does not handle FNeg and
subsequently treats FNeg as binary operator, leading to an assertion
failure or segmentation fault if built without assertions.

Originally I reproduced this with llvm-dis on a bitcode file, which I
unfortunately cannot share and also cannot really reduce.

But PR45426 describes the same issue and has a reproducer with Clang, so
I'll go with that.

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fhahn created this revision.Aug 20 2020, 2:47 AM
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fhahn requested review of this revision.Aug 20 2020, 2:47 AM
aprantl accepted this revision.Aug 20 2020, 8:31 AM
This revision is now accepted and ready to land.Aug 20 2020, 8:31 AM
This revision was landed with ongoing or failed builds.Aug 21 2020, 8:51 AM
This revision was automatically updated to reflect the committed changes.