[llvm-branch-commits] [NFC][PromoteMem2Reg] move (PR #142468)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/142468

`IncomingVals`, `IncomingLocs`, `Worklist` into class members.
They are all DFS state related, as `Visited`. But visited is already a
class member.

On it's own the patch has no value, but it
simplify stuff in the next patch.