Update HTML diagnostics to honor the different between 'event' and 'control-flow' diagnostics.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65877 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/HTMLDiagnostics.cpp b/lib/Frontend/HTMLDiagnostics.cpp
index cb05e55..9996fbb 100644
--- a/lib/Frontend/HTMLDiagnostics.cpp
+++ b/lib/Frontend/HTMLDiagnostics.cpp
@@ -418,7 +418,13 @@
     else
       os << "Path" << num;
     
-    os << "\" class=\"msg\" style=\"margin-left:" << PosNo << "ex";
+    os << "\" class=\"msg";
+    switch (P.getKind()) {
+      default: break;
+      case PathDiagnosticPiece::Event: os << " msgEvent"; break;
+      case PathDiagnosticPiece::ControlFlow: os << " msgControl"; break;
+    }    
+    os << "\" style=\"margin-left:" << PosNo << "ex";
     if (em < max_line/2) os << "; max-width:" << em << "em";
     os << "\">";