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This reapplies r289828 (reverted in r289833 as it broke the address sanitizer). The debugloc is now only set when the instruction is not a call, as this causes the verifier to assert (the inliner requires an inlinable callsite to have a debug loc if the caller and callee have debug info). Original commit message: Simplify CFG will try to sink the last instruction in a series of basic blocks, creating a "common" instruction in the successor block (sinkLastInstruction). When it does this, the debug location of the single instruction should be the merged debug locations of the commoned instructions. Original review: https://reviews.llvm.org/D27590 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290973 91177308-0d34-0410-b5e6-96231b3b80d8
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