Fix goto-def and glyph for builtin operators.

src/EditorFeatures/Core/FindUsages/IDefinitionsAndReferencesFactory.cs

@@ -97,6 +97,18 @@ internal static class DefinitionItemExtensions
             // root definition node for it.  That node won't be navigable.
             if (definition.Kind != SymbolKind.Namespace)
             {
+                if (definition is IMethodSymbol methodSymbol &&
+                    methodSymbol.MethodKind == MethodKind.BuiltinOperator)
+                {
+                    // Built-in operators (like string's operator `==`) don't have any actual
+                    // locations.  But we still want to be able to go-to def on them. Treat them as
+                    // a metadata-definition as that's how they're viewed by the rest of the
+                    // language service.
+                    return DefinitionItem.CreateMetadataDefinition(
+                        tags, displayParts, nameDisplayParts, project,
+                        definition, properties, displayIfNoReferences);
+                }
+
                 foreach (var location in definition.Locations)
                 {
                     if (location.IsInMetadata)

src/Features/Core/Portable/Shared/Extensions/ISymbolExtensions_2.cs

@@ -93,11 +93,14 @@ public static Glyph GetGlyph(this ISymbol symbol)
                     {
                         var methodSymbol = (IMethodSymbol)symbol;
 
-                        if (methodSymbol.MethodKind == MethodKind.UserDefinedOperator || methodSymbol.MethodKind == MethodKind.Conversion)
+                        if (methodSymbol.MethodKind == MethodKind.UserDefinedOperator ||
+                            methodSymbol.MethodKind == MethodKind.Conversion ||
+                            methodSymbol.MethodKind == MethodKind.BuiltinOperator)
                         {
                             return Glyph.Operator;
                         }
-                        else if (methodSymbol.IsExtensionMethod || methodSymbol.MethodKind == MethodKind.ReducedExtension)
+                        else if (methodSymbol.IsExtensionMethod ||
+                                 methodSymbol.MethodKind == MethodKind.ReducedExtension)
                         {
                             publicIcon = Glyph.ExtensionMethodPublic;
                         }