[PATCH] D125000: [RS4GC] Cache BaseDefiningValueResult instead of BDV (NFC)

[Dmitry Makogon via Phabricator via llvm-commits]

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This refactors RS4GC to make use of the `BaseDefiningValueResult` struct returned by `findBaseDefiningValue`.
This struct stores a BDV and a `IsKnownBase` flag. However, we ignored the flag and only used the BDV.
To check whether a BDV is a known base we used a separate function `isKnownBaseResult`, which returned effectively the same value as the flag in the BaseDefiningValueResult struct.
With the patch we cache not only the BDV, but this BaseDefiningValueResult struct and instead of calling `isKnownBaseResult` we just check the flag.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125000

Files:
  llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp

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