Pass a reference to ValueEnumerator.

NFC. This will just make it easier to use std::unique_ptr in a caller.

llvm-svn: 222170

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -1877,7 +1877,7 @@ static void WriteModule(const Module *M, BitstreamWriter &Stream) {
   Stream.EmitRecord(bitc::MODULE_CODE_VERSION, Vals);
 
   // Analyze the module, enumerating globals, functions, etc.
-  ValueEnumerator VE(M);
+  ValueEnumerator VE(*M);
 
   // Emit blockinfo, which defines the standard abbreviations etc.
   WriteBlockInfo(VE, Stream);