[NFC] Fixes -Wrange-loop-analysis warnings

This avoids new warnings due to D68912 adds -Wrange-loop-analysis to -Wall.

Differential Revision: https://reviews.llvm.org/D71857
diff --git a/clang/lib/CodeGen/CodeGenPGO.cpp b/clang/lib/CodeGen/CodeGenPGO.cpp
index 1d45da8..bad796b 100644
--- a/clang/lib/CodeGen/CodeGenPGO.cpp
+++ b/clang/lib/CodeGen/CodeGenPGO.cpp
@@ -167,7 +167,7 @@
   bool TraverseBlockExpr(BlockExpr *BE) { return true; }
   bool TraverseLambdaExpr(LambdaExpr *LE) {
     // Traverse the captures, but not the body.
-    for (const auto &C : zip(LE->captures(), LE->capture_inits()))
+    for (auto C : zip(LE->captures(), LE->capture_inits()))
       TraverseLambdaCapture(LE, &std::get<0>(C), std::get<1>(C));
     return true;
   }