Revert "runtime: allow update of system stack bounds on callback from C thread"

This reverts CL 525455. The test fails to build on darwin, alpine, and
android.

For #62440.

Change-Id: I39c6b1e16499bd61e0f166de6c6efe7a07961e62
Reviewed-on: https://go-review.googlesource.com/c/go/+/527317
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

1 files changed, 0 insertions, 43 deletions

diff --git a/src/runtime/testdata/testprogcgo/stackswitch.go b/src/runtime/testdata/testprogcgo/stackswitch.go
deleted file mode 100644
index b4bb5f5fd9..0000000000
--- a/src/runtime/testdata/testprogcgo/stackswitch.go
+++ /dev/null
@@ -1,43 +0,0 @@
-// 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.
-
-//go:build unix && !openbsd
-
-package main
-
-/*
-void callStackSwitchCallbackFromThread(void);
-*/
-import "C"
-
-import (
-	"fmt"
-	"runtime/debug"
-)
-
-func init() {
-	register("StackSwitchCallback", StackSwitchCallback)
-}
-
-//export stackSwitchCallback
-func stackSwitchCallback() {
-	// We want to trigger a bounds check on the g0 stack. To do this, we
-	// need to call a splittable function through systemstack().
-	// SetGCPercent contains such a systemstack call.
-	gogc := debug.SetGCPercent(100)
-	debug.SetGCPercent(gogc)
-}
-
-
-// Regression test for https://go.dev/issue/62440. It should be possible for C
-// threads to call into Go from different stacks without crashing due to g0
-// stack bounds checks.
-//
-// N.B. This is only OK for threads created in C. Threads with Go frames up the
-// stack must not change the stack out from under us.
-func StackSwitchCallback() {
-	C.callStackSwitchCallbackFromThread();
-
-	fmt.Printf("OK\n")
-}