CppEditor: Store typedefed name for anonymous structs

... and use it as the struct display name in some places.

Fixes: QTCREATORBUG-26611
Change-Id: I1b127f5705307a0fabd2441ff871162c882927a5
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/3rdparty/cplusplus/Symbols.cpp

@@ -635,6 +635,11 @@ void Class::addBaseClass(BaseClass *baseClass)
 FullySpecifiedType Class::type() const
 { return FullySpecifiedType(const_cast<Class *>(this)); }
 
+const Name *Class::prettyName() const
+{
+    return _canonicalTypedefName ? _canonicalTypedefName : name();
+}
+
 void Class::visitSymbol0(SymbolVisitor *visitor)
 {
     if (visitor->visit(this)) {