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recent discussions. Poison can't make every value that depends on it act in maximally undefined ways, because the optimizer may still hoist code following the usual rules for undef. Make Poison invoke its full undefined behavior only when it reaches an instruction with externally visible side effects. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145913 91177308-0d34-0410-b5e6-96231b3b80d8
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