[PATCH] D122900: [x86] Disable optimization involved in an infinite loop inside DAG combiner.

[pierre gousseau via Phabricator via llvm-commits]

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The issue affects targets supporting fast-lzcnt such as btver2.
This revert the optimization to fix the infinite loop while we look at the best way to fix the infinite loop.
This fixes Issue https://github.com/llvm/llvm-project/issues/54694


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122900

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/test/CodeGen/X86/lzcnt-zext-cmp.ll

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