internal/runtime/maps: re-enable some tests

Re-enable tests for stack-allocated maps and fast map accessors.
Those are implemented now.

Update #54766

Change-Id: I8c019702bd9fb077b2fe3f7c78e8e9e10d2263a6
Reviewed-on: https://go-review.googlesource.com/c/go/+/642376
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Keith Randall <khr@golang.org>

Author: randall77

src/internal/runtime/maps/map_swiss_test.go

@@ -50,7 +50,6 @@ func TestTableGroupCount(t *testing.T) {
 	var testCases = []struct {
 		n      int     // n is the number of map elements
 		escape mapCase // expected values for escaping map
-		// TODO(go.dev/issue/54766): implement stack allocated maps
 	}{
 		{
 			n: -(1 << 30),

src/runtime/map_test.go

@@ -674,10 +674,6 @@ func TestIgnoreBogusMapHint(t *testing.T) {
 var testNonEscapingMapVariable int = 8
 
 func TestNonEscapingMap(t *testing.T) {
-	if goexperiment.SwissMap {
-		t.Skip("TODO(go.dev/issue/54766): implement stack allocated maps")
-	}
-
 	n := testing.AllocsPerRun(1000, func() {
 		m := map[int]int{}
 		m[0] = 0

test/codegen/maps.go

@@ -4,11 +4,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// TODO(#54766): Temporarily disable for swissmap, which have fast variants
-// disabled. This test expects fast variants.
-//
-//go:build !goexperiment.swissmap
-
 package codegen
 
 // This file contains code generation tests related to the handling of