ClangCodeModel: Support "parentheses" matching for ternary operator

That is, show which ":" belongs to which "?" when the cursor is on one
of them.

Fixes: QTCREATORBUG-1410
Change-Id: Ie19360b3dfc82d92c264d99a5aa1864eda66e5c8
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cpptools/semantichighlighter.h

@@ -61,6 +61,8 @@ public:
         VirtualFunctionDeclarationUse,
         AngleBracketOpen,
         AngleBracketClose,
+        TernaryIf,
+        TernaryElse,
     };
 
     using HighlightingRunner = std::function<QFuture<TextEditor::HighlightingResult> ()>;