all: add push linknames to allow legacy pull linknames

CL 585358 adds restrictions to disallow pull-only linknames
(currently off by default). Currently, there are quite some pull-
only linknames in user code in the wild. In order not to break
those, we add push linknames to allow them to be pulled. This CL
includes linknames found in a large code corpus (thanks Matthew
Dempsky and Michael Pratt for the analysis!), that are not
currently linknamed.

Updates #67401.

Change-Id: I32f5fc0c7a6abbd7a11359a025cfa2bf458fe767
Reviewed-on: https://go-review.googlesource.com/c/go/+/586137
Reviewed-by: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

badlinkname.go

@@ -0,0 +1,27 @@
+// Copyright 2024 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.
+
+package reality
+
+import _ "unsafe"
+
+// As of Go 1.22, the symbols below are found to be pulled via
+// linkname in the wild. We provide a push linkname here, to
+// keep them accessible with pull linknames.
+// This may change in the future. Please do not depend on them
+// in new code.
+
+//go:linkname aeadAESGCMTLS13
+//go:linkname cipherSuiteTLS13ByID
+//go:linkname cipherSuitesTLS13
+//go:linkname defaultCipherSuitesTLS13
+//go:linkname defaultCipherSuitesTLS13NoAES
+//go:linkname errShutdown
+
+// The compiler doesn't allow linknames on methods, for good reasons.
+// We use this trick to push linknames of the methods.
+// Do not call them in this package.
+
+//go:linkname badlinkname_halfConn_incSeq crypto/tls.(*halfConn).incSeq
+func badlinkname_halfConn_incSeq(*halfConn)