[PATCH] D159406: [SelectionDAG] Generalise SelectionDAG::computeOverflowKind to support other opcodes

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

Now the tricky bit - hooking this into DAGCombiner and adding suitable testing.

visitMULO already has some specific case overflow detection code, so we can start by replacing it with a willNotOverflowMul test, similar to what visitADDO/visitSUBO do.

Make sure you create your diff with context: `git diff HEAD~1 -U999999 > mypatch.patch`


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