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While preserving the return value for @llvm.experimental.deoptimize at the IR level is useful during mid-level optimization, doing so at the machine instruction level requires generating some extra code and a return that is non-ideal. This change has LLVM lower ``` %val = call @llvm.experimental.deoptimize ret %val ``` to effectively ``` call @__llvm_deoptimize() unreachable ``` instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265502 91177308-0d34-0410-b5e6-96231b3b80d8
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