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[Docs] Add LangRef documentation for freeze instruction

Authored by nlopes on Tue, Nov 5, 3:32 AM.

Description

[Docs] Add LangRef documentation for freeze instruction

Summary:

  • Describe the new freeze instruction
  • Make it explicit that branch on undef/poison is UB

Reviewers: chandlerc, majnemer, efriedma, nikic, reames, jdoerfert, lebedev.ri, regehr

Subscribers: fhahn, bollu, lebedev.ri, delcypher, spatel, filcab, llvm-commits, aqjune

Differential Revision: https://reviews.llvm.org/D29121

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