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Summary: These allow you to get and set the operator of a dag node, without affecting its list of arguments. `!getop` is slightly fiddly because in many contexts you need its return value to have a static type more specific than 'any record'. It works to say `!cast<BaseClass>(!getop(...))`, but it's cumbersome, so I made `!getop` take an optional type suffix itself, so that can be written as the shorter `!getop<BaseClass>(...)`. Reviewers: hfinkel, nhaehnle Reviewed By: nhaehnle Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D71191
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