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[DAGCombiner] refactor function that hoists bitwise logic; NFCI

Description

[DAGCombiner] refactor function that hoists bitwise logic; NFCI

Added FIXME and TODO comments for lack of safety checks.
This function is a suspect in out-of-memory errors as discussed in
the follow-up thread to r347917:
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20181203/608593.html

Details

Committed
spatelThu, Dec 6, 9:08 AM
Parents
rL348500: [Sanitizer] getmntinfo support in FreeBSD
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