internal/mod/mvs/internal/...: remove ignore build tags

These packages are going to be used by internal/mod/mvs in the
next CL (https://cuelang.org/cl/1168705).

For #2330.

Signed-off-by: Roger Peppe <[email protected]>
Change-Id: I55f55282b95c88bedf6dcc0041e32c1e1a16b84c
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1168792
TryBot-Result: CUEcueckoo <[email protected]>
Reviewed-by: Paul Jolly <[email protected]>
Unity-Result: CUE porcuepine <[email protected]>

Author: rogpeppe

internal/mod/mvs/internal/par/atomic_go1.18.go

@@ -1,5 +1,3 @@
-//go:build ignore
-
 // Copyright 2020 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.

internal/mod/mvs/internal/par/atomic_go1.19.go

@@ -1,5 +1,3 @@
-//go:build ignore
-
 // Copyright 2020 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.

internal/mod/mvs/internal/par/queue.go

@@ -1,5 +1,3 @@
-//go:build ignore
-
 // Copyright 2018 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.
@@ -11,6 +9,7 @@ import (
 	"errors"
 	"math/rand"
 	"sync"
+	"sync/atomic"
 )
 
 // Work manages a set of work items to be executed in parallel, at most once each.
@@ -141,7 +140,7 @@ type Cache[K comparable, V any] struct {
 }
 
 type cacheEntry[V any] struct {
-	done   atomicBool
+	done   atomic.Bool
 	mu     sync.Mutex
 	result V
 }

internal/mod/mvs/internal/par/queue_test.go

@@ -1,5 +1,3 @@
-//go:build ignore
-
 // Copyright 2018 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.

internal/mod/mvs/internal/par/work.go

@@ -1,5 +1,3 @@
-//go:build ignore
-
 // Copyright 2023 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.