[PATCH] D137539: [SIFoldOperands] Small code cleanups, NFC.

[Pierre van Houtryve via Phabricator via llvm-commits]

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I've been trying to understand the backend better and decided to read the code of this pass.
While doing so, I noticed parts that could be refactored to be a tiny bit clearer.
I tried to keep the changes minimal, a non-exhaustive list of changes is:

- Stylistic changes to better fit LLVM's coding style
- Removing dead/useless functions (e.g. FoldCandidate had getters, but it's a public struct!)
  - Saving regs/opcodes in variables if they're going to be used multiple times in the same condition


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137539

Files:
  llvm/lib/Target/AMDGPU/SIFoldOperands.cpp

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