Fixes handling of empty lines in macros.

Now correctly formats:
 #define A \
   \
   b;
to
 #define A b;

Added the state whether an unwrapped line is a macro to the debug
output.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174878 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Format/UnwrappedLineParser.cpp b/lib/Format/UnwrappedLineParser.cpp
index cb95608..3030789 100644
--- a/lib/Format/UnwrappedLineParser.cpp
+++ b/lib/Format/UnwrappedLineParser.cpp
@@ -766,7 +766,8 @@
   if (Line->Tokens.empty())
     return;
   DEBUG({
-    llvm::dbgs() << "Line(" << Line->Level << "): ";
+    llvm::dbgs() << "Line(" << Line->Level << ")"
+                 << (Line->InPPDirective ? " MACRO" : "") << ": ";
     for (std::list<FormatToken>::iterator I = Line->Tokens.begin(),
                                           E = Line->Tokens.end();
          I != E; ++I) {