cgen: better alias handling for references/shared (#17656)

vlib/v/tests/aliased_field_access_test.v

@@ -0,0 +1,12 @@
+struct Data {
+	field int
+}
+
+type AliasWithPtr = &Data
+
+fn test_aliased_field_access_test() {
+	data_with_ptr := AliasWithPtr(&Data{
+		field: 1
+	})
+	assert data_with_ptr.field == 1
+}

vlib/v/tests/known_errors/testdata/shared_in_alias_test.vv

@@ -0,0 +1,12 @@
+struct Data {
+	field int
+}
+
+type AliasWithShared = shared Data
+
+fn test_shared_in_alias() {
+	data_with_shared := AliasWithShared(&Data{
+		field: 1
+	})
+	assert data_with_shared.field == 1
+}