Put "BUGDESC" comment tag on its own line.

llvm-svn: 49103
diff --git a/clang/Driver/HTMLDiagnostics.cpp b/clang/Driver/HTMLDiagnostics.cpp
index 79eae90..8269666 100644
--- a/clang/Driver/HTMLDiagnostics.cpp
+++ b/clang/Driver/HTMLDiagnostics.cpp
@@ -140,7 +140,7 @@
   
   if (!BugDesc.empty()) {
     std::ostringstream os;
-    os << "<!-- BUGDESC " << BugDesc << " -->\n";
+    os << "\n<!-- BUGDESC " << BugDesc << " -->\n";
     R.InsertStrBefore(SourceLocation::getFileLoc(FileID, 0), os.str());
   }