Duncan P. N. Exon Smith ec6f7fed54 TransformUtils: Avoid getNodePtrUnchecked() in integer division, NFC ...

Stop relying on `getNodePtrUnchecked()` being useful on invalid
iterators.  This function is documented to be for internal use only, and
the pointer type will eventually have to change to remove UB from
ilist_iterator.  Instead, check the iterator before it has been
invalidated.

llvm-svn: 261497

2016-02-21 20:14:29 +00:00

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