ItaniumDemangler: Update BinaryExpr::match to match the ctor

Not sure if this could use more testing, but hopefully this is adequate.

llvm/include/llvm/Demangle/ItaniumDemangle.h

@@ -1782,7 +1782,9 @@ public:
       : Node(KBinaryExpr, Prec_), LHS(LHS_), InfixOperator(InfixOperator_),
         RHS(RHS_) {}
 
-  template<typename Fn> void match(Fn F) const { F(LHS, InfixOperator, RHS); }
+  template <typename Fn> void match(Fn F) const {
+    F(LHS, InfixOperator, RHS, getPrecedence());
+  }
 
   void printLeft(OutputBuffer &OB) const override {
     bool ParenAll = OB.isGtInsideTemplateArgs() && InfixOperator == ">";

llvm/lib/Demangle/ItaniumDemangle.cpp

@@ -172,6 +172,10 @@ struct DumpVisitor {
       return printStr("TemplateParamKind::Template");
     }
   }
+  void print(llvm::itanium_demangle::Node::Prec) {
+    // Do nothing, the printing functions handle precedence with parentheses
+    // already.
+  }
 
   void newLine() {
     printStr("\n");