Run clang-tidy's performance-unnecessary-copy-initialization over LLVM.

No functionality change intended.

llvm-svn: 272516
diff --git a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
index 1074276..92ba475 100644
--- a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
@@ -2120,7 +2120,7 @@
         MachineBasicBlock::iterator StartIt = SI, NextIt;
         MachineInstr *CopyIn = nullptr;
         if (SrcRR.Reg != FoundR || SrcRR.Sub != 0) {
-          DebugLoc DL = SI->getDebugLoc();
+          const DebugLoc &DL = SI->getDebugLoc();
           CopyIn = BuildMI(B, StartIt, DL, HII.get(TargetOpcode::COPY), FoundR)
                       .addOperand(SrcOp);
         }