gopls: Add TODO for handling cross-package references and refine local reference matching logic

Updated the code in xrefs.go and references.go.

Updates golang/go#71754

Author: groot-guo

gopls/internal/cache/xrefs/xrefs.go

@@ -124,6 +124,8 @@ func Index(files []*parsego.File, pkg *types.Package, info *types.Info, asmFiles
 			}
 			obj := pkg.Scope().Lookup(name)
 			if obj == nil {
+				// TODO(grootguo): If the object is not found in the current package,
+				// consider handling cross-package references.
 				continue
 			}
 			objects := getObjects(pkg)

gopls/internal/golang/references.go

@@ -623,7 +623,10 @@ func localReferences(pkg *cache.Package, targets map[types.Object]bool, correspo
 			if obj == nil {
 				continue
 			}
-			if rng, err := pgf.NodeRange(id); err == nil && matches(obj) {
+			if !matches(obj) {
+				continue
+			}
+			if rng, err := pgf.NodeRange(id); err == nil {
 				asmLocation := protocol.Location{
 					URI:   pgf.URI,
 					Range: rng,