[PATCH] D60159: Revert "[DAGCombine] Improve Lifetime node chains." and follow-ups

[Bob Haarman via Phabricator via llvm-commits]

inglorion created this revision.
inglorion added reviewers: niravd, rnk.
Herald added a subscriber: hiraditya.
Herald added a project: LLVM.

This reverts r357309 and r357256.

Reason for revert: r357256 causes pathologically slow DAG Combining 1
times on some inputs (PR41352). r357309 builds on r357256 and so is
also reverted here.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D60159

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/X86/swap.ll
  llvm/test/DebugInfo/COFF/lexicalblock.ll

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