[PATCH] D109565: Teach SimplifyCFG to fold switches into lookup tables in more cases.

[Owen Anderson via Phabricator via llvm-commits]

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In particular, it couldn't handle cases where lookup table constant
expressions involved bitcasts. This does not seem to come up
frequently in C++, but comes up reasonably often in Rust via
`#[derive(Debug)]`.

Originally reported by pcwalton.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D109565

Files:
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp
  llvm/test/Transforms/SimplifyCFG/switch-to-lookup-bitcast.ll
  llvm/test/Transforms/SimplifyCFG/switch-to-lookup-gep.ll

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