gvisor: update traceBlockReason for new runtime tracer

The definition for the new constant values lives upstream at:
https://cs.opensource.google/go/go/+/master:src/runtime/trace2runtime.go;l=77-102;drc=b6b72c775ab562c632abf5d93e8c541385edfffc

PiperOrigin-RevId: 587718645

pkg/sync/BUILD

@@ -28,6 +28,7 @@ go_library(
         "runtime_amd64.go",
         "runtime_constants.go",
         "runtime_exectracer1.go",
+        "runtime_exectracer2.go",
         "runtime_go121_unsafe.go",
         "runtime_not_go121_unsafe.go",
         "runtime_other.go",

pkg/sync/runtime_exectracer1.go

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !goexperiment.exectracer2
+
 package sync
 
 // TraceBlockReason constants, from Go's src/runtime/trace.go.

pkg/sync/runtime_exectracer2.go

@@ -0,0 +1,23 @@
+// 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.
+
+//go:build goexperiment.exectracer2
+
+package sync
+
+// TraceBlockReason constants, from Go's src/runtime/trace2runtime.go.
+const (
+	TraceBlockSelect TraceBlockReason = 3 // +checkconst runtime traceBlockSelect
+	TraceBlockSync                    = 5 // +checkconst runtime traceBlockSync
+)