[PATCH] D141993: [CodeGen][WIP] Split some functionality from DetectDeadLanes into its own class to be reused. NFCi

[Craig Topper via Phabricator via llvm-commits]

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This is an alternative to D140382 <https://reviews.llvm.org/D140382>.

This moves the first part of runOnce into a new class that can be
reused by D129735 <https://reviews.llvm.org/D129735>. This encapsulates the ownership of the worklist,
and VRegInfos into the new class. The code for updating the dead
lanes stays in the DetectDeadLanes class.

The new class is created on the stack during runOnMachineFunction
so all the data structures will be deleted after each run.
Previously we only cleared them after each run so the memory might
have stayed allocated across runs. Hopefully this allocation change
isn't a big deal.

I might still do some reordering of the functions to keep the classes
together, but I didn't do that yet to reduce the diff size.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141993

Files:
  llvm/include/llvm/CodeGen/DetectDeadLanes.h
  llvm/lib/CodeGen/DetectDeadLanes.cpp

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