Change how raw lexers are handled: instead of creating them and then
using LexRawToken, create one and use LexFromRawLexer.  This avoids
twiddling the RawLexer flag around and simplifies some code (even 
speeding raw lexing up a tiny bit).

This change also improves the token paster to use a Lexer on the stack
instead of new/deleting it. 



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57393 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/RewriteMacros.cpp b/Driver/RewriteMacros.cpp
index 5106367..8931014 100644
--- a/Driver/RewriteMacros.cpp
+++ b/Driver/RewriteMacros.cpp
@@ -73,7 +73,7 @@
   
   Token RawTok;
   do {
-    RawLex.LexRawToken(RawTok);
+    RawLex.LexFromRawLexer(RawTok);
     
     // If we have an identifier with no identifier info for our raw token, look
     // up the indentifier info.  This is important for equality comparison of