Change range-based for-loops to be -Wrange-loop-analysis clean.
No functionality change.

llvm-svn: 234964
diff --git a/clang/lib/CodeGen/CoverageMappingGen.cpp b/clang/lib/CodeGen/CoverageMappingGen.cpp
index 07db6c7..d26eced 100644
--- a/clang/lib/CodeGen/CoverageMappingGen.cpp
+++ b/clang/lib/CodeGen/CoverageMappingGen.cpp
@@ -748,7 +748,7 @@
         size_t Index =
             pushRegion(Counter::getZero(), getStart(CS->body_front()),
                        getEnd(CS->body_back()));
-        for (const auto &Child : CS->children())
+        for (const auto *Child : CS->children())
           Visit(Child);
         popRegions(Index);
       }