bisect: move to internal/bisect until API is reviewed

I wasn't thinking of this package as an exported library,
but of course it is, so it should go through proposal review.
Moving to internal until that happens.

Change-Id: Ic8abbe5f6530d5d6201114c1799e26d604f3dd64
Reviewed-on: https://go-review.googlesource.com/c/tools/+/492976
TryBot-Bypass: Russ Cox <[email protected]>
Run-TryBot: Russ Cox <[email protected]>
Reviewed-by: Robert Findley <[email protected]>

Author: rsc

cmd/bisect/main.go

@@ -25,8 +25,9 @@
 // arguments. For each change that matches the pattern, the target must
 // enable that change and also print one or more “match lines”
 // (to standard output or standard error) describing the change.
-// The [golang.org/x/tools/bisect] package provides functions to help
-// targets implement this protocol.
+// The [golang.org/x/tools/internal/bisect] package provides functions to help
+// targets implement this protocol. We plan to publish that package
+// in a non-internal location after finalizing its API.
 //
 // # Command Line Flags
 //
@@ -101,7 +102,7 @@ import (
 	"strings"
 	"time"
 
-	"golang.org/x/tools/bisect"
+	"golang.org/x/tools/internal/bisect"
 )
 
 // Preserve import of bisect, to allow [bisect.Match] in the doc comment.

cmd/bisect/main_test.go

@@ -16,7 +16,7 @@ import (
 	"strings"
 	"testing"
 
-	"golang.org/x/tools/bisect"
+	"golang.org/x/tools/internal/bisect"
 	"golang.org/x/tools/internal/diffp"
 	"golang.org/x/tools/txtar"
 )