Use llvm::copy. NFC

llvm-svn: 347126
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 31a6335..9f6027c 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -4026,7 +4026,7 @@
 
     if (ModHash)
       // Save the written hash value.
-      std::copy(std::begin(Vals), std::end(Vals), std::begin(*ModHash));
+      llvm::copy(Vals, std::begin(*ModHash));
   }
 }