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Commit 75f50e15 authored by Zhengyang Liu's avatar Zhengyang Liu
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Adding PoisonValue for representing poison value explicitly in IR 

Define ConstantData::PoisonValue.
Add support for poison value to LLLexer/LLParser/BitcodeReader/BitcodeWriter.
Add support for poison value to llvm-c interface.
Add support for poison value to OCaml binding.
Add m_Poison in PatternMatch.

Differential Revision: https://reviews.llvm.org/D71126
parent 3fb08798
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