Update to go1.24.0

src/reflect/map_swiss_test.go

@@ -0,0 +1,30 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build goexperiment.swissmap
+
+package reflect_test
+
+import (
+	"reflect"
+	"testing"
+)
+
+func testGCBitsMap(t *testing.T) {
+	// Unlike old maps, we don't manually construct GC data for swiss maps,
+	// instead using the public reflect API in groupAndSlotOf.
+}
+
+// See also runtime_test.TestGroupSizeZero.
+func TestGroupSizeZero(t *testing.T) {
+	st := reflect.TypeFor[struct{}]()
+	grp := reflect.MapGroupOf(st, st)
+
+	// internal/runtime/maps when create pointers to slots, even if slots
+	// are size 0. We should have reserved an extra word to ensure that
+	// pointers to the zero-size type at the end of group are valid.
+	if grp.Size() <= 8 {
+		t.Errorf("Group size got %d want >8", grp.Size())
+	}
+}