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It turns out, all callsites of the simplifier are guarded by a check for CallInst::getCalledFunction (i.e., to make sure the callee is direct). This check wasn't done when trying to further optimize a simplified fortified libcall, introduced by a refactoring in r225640. Fix that, add a testcase, and document the requirement. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225895 91177308-0d34-0410-b5e6-96231b3b80d8
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