ObjCARC: Don't look at users of ConstantData
Stop looking at users of UndefValue and ConstantPointerNull in the
objective C ARC optimizers. The other users aren't actually
interesting, since they're not pointing at a particular object. I
imagine these calls could be optimized through -instcombine... maybe
they already are?
These early returns will be required at some point in the future, with a
WIP patch that asserts when someone accesses a use-list on ConstantData.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282338
91177308-0d34-0410-b5e6-
96231b3b80d8
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