Fix layouting of tokens with a leading escaped newline.

If a token follows directly on an escaped newline, the escaped newline
is stored with the token. Since we re-layout escaped newlines, we need
to treat them just like normal whitespace - thus, we need to increase
the whitespace-length of the token, while decreasing the token length
(otherwise the token length contains the length of the escaped newline
and we double-count it while indenting).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171706 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Format/UnwrappedLineParser.h b/lib/Format/UnwrappedLineParser.h
index 2308c92..59844e4 100644
--- a/lib/Format/UnwrappedLineParser.h
+++ b/lib/Format/UnwrappedLineParser.h
@@ -32,7 +32,7 @@
 struct FormatToken {
   FormatToken()
       : NewlinesBefore(0), HasUnescapedNewline(false), WhiteSpaceLength(0),
-        IsFirst(false) {
+        TokenLength(0), IsFirst(false) {
   }
 
   /// \brief The \c Token.
@@ -58,6 +58,11 @@
   /// the \c Token.
   unsigned WhiteSpaceLength;
 
+  /// \brief The length of the non-whitespace parts of the token. This is
+  /// necessary because we need to handle escaped newlines that are stored
+  /// with the token.
+  unsigned TokenLength;
+
   /// \brief Indicates that this is the first token.
   bool IsFirst;
 };