[llvm] [llvm-profgen] More tweaks to warnings (PR #68608)

[via llvm-commits]

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@@ -40,6 +40,7 @@
 #include <string>
 #include <unordered_map>
 #include <unordered_set>
+#include <utility>
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WenleiHe wrote:

why is this change? 

https://github.com/llvm/llvm-project/pull/68608