[CSBindings] Reformat type variable and possible bindings to use - instead of () when printing.

Author: Amritpan Kaur

lib/Sema/CSBindings.cpp

@@ -1608,11 +1608,11 @@ unsigned BindingSet::getNumViableLiteralBindings() const {
 void BindingSet::dump(TypeVariableType *typeVar, llvm::raw_ostream &out,
                       unsigned indent) const {
   out.indent(indent);
-  out << "(";
+  out << "- ";
   if (typeVar)
     out << "$T" << typeVar->getImpl().getID();
   dump(out, 1);
-  out << ")\n";
+  out << "\n";
 }
 
 void BindingSet::dump(llvm::raw_ostream &out, unsigned indent) const {