[compiler-rt] [compiler-rt] Include <functional> in FuzzerDriver.cpp for `std::ref`. (PR #146828)

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You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- compiler-rt/lib/fuzzer/FuzzerDriver.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/compiler-rt/lib/fuzzer/FuzzerDriver.cpp b/compiler-rt/lib/fuzzer/FuzzerDriver.cpp
index 734cf28b4..40322e231 100644
--- a/compiler-rt/lib/fuzzer/FuzzerDriver.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerDriver.cpp
@@ -24,11 +24,11 @@
 #include <chrono>
 #include <cstdlib>
 #include <cstring>
+#include <fstream>
 #include <functional>
 #include <mutex>
 #include <string>
 #include <thread>
-#include <fstream>
 
 // This function should be present in the libFuzzer so that the client
 // binary can test for its existence.

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https://github.com/llvm/llvm-project/pull/146828