internal/gcimporter: extend markBlack workaround go1.22

Although the workaround in CL 621855 was effective for gopls,
which uses go1.23, the x/tools builders using go1.22 are
still bumping into this data race.

This change applies the same workaround to go1.22;
the data type has not changed.

Fixes golang/go#69912
Fixed golang/go#70015

Change-Id: I9f12f8815a0b089a188b9d02aec9d07eb30a496a
Reviewed-on: https://go-review.googlesource.com/c/tools/+/622319
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Robert Findley <[email protected]>

Author: adonovan

internal/gcimporter/iimport_go123.go renamed to internal/gcimporter/iimport_go122.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.23 && !go1.24
+//go:build go1.22 && !go1.24
 
 package gcimporter
 
@@ -12,8 +12,7 @@ import (
 	"unsafe"
 )
 
-// TODO(rfindley): delete this workaround once gopls no longer compiles with
-// go1.23.
+// TODO(rfindley): delete this workaround once go1.24 is assured.
 
 func init() {
 	// Update markBlack so that it correctly sets the color