Fix DebugLoc propagation for unreachable LoadInst
Summary: Currently, when GVN creates a load and when InstCombine creates a new store for unreachable Load, the DebugLoc info gets lost. Reviewers: dberlin, davide, aprantl Reviewed By: aprantl Subscribers: davide, llvm-commits Differential Revision: https://reviews.llvm.org/D34639 llvm-svn: 308404
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