[PATCH] D146349: [InstCombine] Make `FoldOpIntoSelect` handle non-constants and use condition to deduce constants.

[Noah Goldstein via Phabricator via llvm-commits]

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1. Make `FoldOpIntoSelect` handle non-constants by returning `nullptr` instead of aborting.
2. Make the fold use the information present in the condition for deducing constants i.e: ``` %c = icmp eq i8 %x, 10 %s = select i1 %c, i8 3, i8 2 %r = mul i8 %x, %s ```

  If we fold the `mul` into the select, on the true side we insert `10` for `%x` in the `mul`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146349

Files:
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp

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