Reenable the default lexer.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59843 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/PPLexerChange.cpp b/lib/Lex/PPLexerChange.cpp
index e755edb..5716d49 100644
--- a/lib/Lex/PPLexerChange.cpp
+++ b/lib/Lex/PPLexerChange.cpp
@@ -74,7 +74,7 @@
   if (MaxIncludeStackDepth < IncludeMacroStack.size())
     MaxIncludeStackDepth = IncludeMacroStack.size();
 
-#if 0
+#if 1
   Lexer *TheLexer = new Lexer(SourceLocation::getFileLoc(FileID, 0), *this);
   EnterSourceFileWithLexer(TheLexer, CurDir);
 #else