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If all the operands to a phi node are a load, instcombine will try to pull them through the phi node, combining them into a single load. When it does this, the debug location of the new load should be the merged debug locations of the phi node arguments. Patch 5 of 8 for D26256. Folding of a load operation. Differential Revision: https://reviews.llvm.org/D26256 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289688 91177308-0d34-0410-b5e6-96231b3b80d8