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cd872ebe94
The `BasicBlock::getFirstInsertionPt` call may return `std::end` for the BB. Dereferencing the end iterator results in an assertion failure "(!NodePtr->isKnownSentinel()), function operator*". Ensure that the returned iterator is valid before dereferencing it. If the end is returned, move one position backward to get a valid insertion point. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@316401 91177308-0d34-0410-b5e6-96231b3b80d8