runtime: remove unused code

Change-Id: Ifb9864704f55e27adfa5c21452fed5a243468d13
GitHub-Last-Rev: 6b000e7
GitHub-Pull-Request: #67013
Reviewed-on: https://go-review.googlesource.com/c/go/+/581376
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

src/runtime/proc.go

@@ -6954,18 +6954,6 @@ func sync_atomic_runtime_procUnpin() {
 	procUnpin()
 }
 
-//go:linkname internal_weak_runtime_procPin internal/weak.runtime_procPin
-//go:nosplit
-func internal_weak_runtime_procPin() int {
-	return procPin()
-}
-
-//go:linkname internal_weak_runtime_procUnpin internal/weak.runtime_procUnpin
-//go:nosplit
-func internal_weak_runtime_procUnpin() {
-	procUnpin()
-}
-
 // Active spinning for sync.Mutex.
 //
 //go:linkname sync_runtime_canSpin sync.runtime_canSpin