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Commit 46945b9e authored by Sanjay Patel's avatar Sanjay Patel
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[InstCombine] add/use overflowing math helper functions; NFC 

The mul case can already be refactored to use this similar to
rL342278.
The sub case is proposed in D52075.

llvm-svn: 342289
parent c68f78d5
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