Move helper classes into anonymous namespaces. NFC.

llvm-svn: 269591

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -37,6 +37,7 @@
 #include <map>
 using namespace llvm;
 
+namespace {
 /// These are manifest constants used by the bitcode writer. They do not need to
 /// be kept in sync with the reader, but need to be consistent within this file.
 enum {
@@ -463,6 +464,7 @@ private:
   }
   std::map<GlobalValue::GUID, unsigned> &valueIds() { return GUIDToValueIdMap; }
 };
+} // end anonymous namespace
 
 static unsigned getEncodedCastOpcode(unsigned Opcode) {
   switch (Opcode) {