rename the MacroExpander class to TokenLexer.  It handles both
token streams and macro lexing, so a more generic name is useful.

llvm-svn: 48071
diff --git a/clang/Lex/Preprocessor.cpp b/clang/Lex/Preprocessor.cpp
index 00e8ddd..789ae6c 100644
--- a/clang/Lex/Preprocessor.cpp
+++ b/clang/Lex/Preprocessor.cpp
@@ -620,7 +620,7 @@
   CurDirLookup = 0;
   
   if (NumCachedMacroExpanders == 0) {
-    CurMacroExpander = new MacroExpander(Tok, Args, *this);
+    CurMacroExpander = new TokenLexer(Tok, Args, *this);
   } else {
     CurMacroExpander = MacroExpanderCache[--NumCachedMacroExpanders];
     CurMacroExpander->Init(Tok, Args);
@@ -641,7 +641,7 @@
 
   // Create a macro expander to expand from the specified token stream.
   if (NumCachedMacroExpanders == 0) {
-    CurMacroExpander = new MacroExpander(Toks, NumToks, *this);
+    CurMacroExpander = new TokenLexer(Toks, NumToks, *this);
   } else {
     CurMacroExpander = MacroExpanderCache[--NumCachedMacroExpanders];
     CurMacroExpander->Init(Toks, NumToks);