Use SmallString instead of SmallVector

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@98436 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/TokenLexer.cpp b/lib/Lex/TokenLexer.cpp
index aae7352..efd1efe 100644
--- a/lib/Lex/TokenLexer.cpp
+++ b/lib/Lex/TokenLexer.cpp
@@ -379,7 +379,7 @@
 /// are more ## after it, chomp them iteratively.  Return the result as Tok.
 /// If this returns true, the caller should immediately return the token.
 bool TokenLexer::PasteTokens(Token &Tok) {
-  llvm::SmallVector<char, 128> Buffer;
+  llvm::SmallString<128> Buffer;
   const char *ResultTokStrPtr = 0;
   do {
     // Consume the ## operator.