put SlotTracker in an anon namespace since it is private.

llvm-svn: 54975

lib/VMCore/AsmWriter.cpp

@@ -37,11 +37,11 @@
 #include <cctype>
 using namespace llvm;
 
-namespace llvm {
-
 // Make virtual table appear in this compilation unit.
 AssemblyAnnotationWriter::~AssemblyAnnotationWriter() {}
 
+namespace {
+
 /// This class provides computation of slot numbers for LLVM Assembly writing.
 ///
 class SlotTracker {
@@ -110,7 +110,7 @@ private:
   void operator=(const SlotTracker &);  // DO NOT IMPLEMENT
 };
 
-}  // end namespace llvm
+}  // end anonymous namespace
 
 char PrintModulePass::ID = 0;
 static RegisterPass<PrintModulePass>