SemanticModel.GetDeclaredSymbol doesn't return the getter symbol for C# expression bodied property initializer

None of the descendant nodes of expression bodied property in C# returns the getter method symbol for that property when GetDeclaredSymbol is invoked on them. This seems wrong as the getter method symbol has IsImplicityDeclared = false, and also has its declaring syntax node as the ArrowExpressionClauseSyntax.

I think we want to handle GetDeclaredSymbol(ArrowExpressionClauseSyntax) to return the property getter if the given arrow expression is parented by a BasePropertyDeclarationSyntax.