s390x: Prevent main thread from getting terminated with SIGPROF when

profiling is enabled

Bug: v8:12952
Change-Id: I4cb41a5fa0e72522b0952c1b8264760e5235c2b9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3699406Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Vasili Skurydzin <vasili.skurydzin@ibm.com>
Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#81152}

src/libsampler/sampler.cc

@@ -19,7 +19,7 @@
 #include <sys/syscall.h>
 #endif
 
-#if V8_OS_AIX
+#if V8_OS_AIX || V8_TARGET_ARCH_S390X
 
 #include "src/base/platform/time.h"
 
@@ -348,10 +348,10 @@ class SignalHandler {
   static void Restore() {
     if (signal_handler_installed_) {
       signal_handler_installed_ = false;
-#if V8_OS_AIX
-      // On Aix & IBMi, SIGPROF can sometimes arrive after the default signal
-      // handler is restored, resulting in intermittent test failure when
-      // profiling is enabled (https://crbug.com/v8/12952)
+#if V8_OS_AIX || V8_TARGET_ARCH_S390X
+      // On Aix, IBMi & zLinux SIGPROF can sometimes arrive after the
+      // default signal handler is restored, resulting in intermittent test
+      // failure when profiling is enabled (https://crbug.com/v8/12952)
       base::OS::Sleep(base::TimeDelta::FromMicroseconds(10));
 #endif
       sigaction(SIGPROF, &old_signal_handler_, nullptr);