[PATCH] D129857: [GlobalOpt] Ignore never loaded global parts in global SRA heuristic

[Nikita Popov via Phabricator via llvm-commits]

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When limiting the number of parts we split a global into, ignore any parts that are never loaded, because we expect these to be optimized away after SRA.

This is intended as an alternative to D129525 <https://reviews.llvm.org/D129525>.

This is based on top of https://gist.github.com/nikic/a041b6739417fd0267a4d9bd58ffb9f2, and NFC patch to add the GlobalPart struct.


https://reviews.llvm.org/D129857

Files:
  llvm/lib/Transforms/IPO/GlobalOpt.cpp
  llvm/test/Transforms/GlobalOpt/sra-many-stores.ll

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