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Basic block selection involves checking successor BBs for PHI nodes that depend on the current BB. In case such BBs are found, the value being selected is a constant and such constant already exists in current BB, it's value is reused. This might lead to wrong locations in some situations, especially if same constant value ends up being materialized twice in two different ways, which discards that sharing and leaves us with wrong debug location in the successor BB. In code this involves the following sequence of calls: SelectionDAGBuilder::HandlePHINodesInSuccessorBlocks -> SelectionDAGBuilder::CopyValueToVirtualRegister -> SelectionDAGBuilder::getNonRegisterValue git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239089 91177308-0d34-0410-b5e6-96231b3b80d8
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