Adjust WaitReasonSemacquire et al. for go1.26

pkg/sync/BUILD

@@ -27,6 +27,7 @@ go_library(
         "runtime.go",
         "runtime_amd64.go",
         "runtime_constants_go125.go",
+        "runtime_constants_go126.go",
         "runtime_constants_not_go125.go",
         "runtime_exectracer2.go",
         "runtime_go121_unsafe.go",

pkg/sync/runtime_constants_go126.go

@@ -0,0 +1,25 @@
+// Copyright 2023 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// https://go.dev/cl/688335 (1.26) reorders waitreason runtime constants, adjusting the values of waitReasonSemacquire et al.
+//go:build go1.26
+
+package sync
+
+// Values for the reason argument to gopark, from Go's src/runtime/runtime2.go.
+const (
+	WaitReasonSelect      uint8 = 18 // +checkconst runtime waitReasonSelect
+	WaitReasonChanReceive uint8 = 19 // +checkconst runtime waitReasonChanReceive
+	WaitReasonSemacquire  uint8 = 13 // +checkconst runtime waitReasonSemacquire
+)

pkg/sync/runtime_constants_not_go125.go

@@ -13,7 +13,8 @@
 // limitations under the License.
 
 // https://go.dev/cl/670497 (1.25) adds a new wait reason, adjusting the value of waitReasonSemacquire.
-//go:build !go1.25
+// https://go.dev/cl/688335 (1.26) reorders waitreason runtime constants, adjusting the values of waitReasonSemacquire et al.
+//go:build !go1.25 && !go1.26
 
 package sync