Sjoerd Meijer 0ed4619679 [TargetLowering] findOptimalMemOpLowering. NFCI. ...

This was a local static funtion in SelectionDAG, which I've promoted to
TargetLowering so that I can reuse it to estimate the cost of a memory
operation in D59787.

Differential Revision: https://reviews.llvm.org/D59766

llvm-svn: 359543

2019-04-30 10:09:15 +00:00

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