Flip and add test

Author: Jlalond

lldb/test/Shell/Register/Core/Inputs/tkill.cpp

@@ -0,0 +1,10 @@
+#include <signal.h>
+#include <sys/syscall.h>
+
+int main() {
+  // Get the current thread ID
+  pid_t tid = syscall(SYS_gettid);
+  // Send a SIGSEGV signal to the current thread
+  syscall(SYS_tkill, tid, SIGSEGV);
+  return 0;
+}

lldb/test/Shell/Register/Core/Inputs/x86-64-linux-tkill.core

@@ -0,0 +1,6 @@
+# XFAIL: system-darwin
+# XFAIL: system-windows
+# RUN: %lldb -b -s %s -c %p/Inputs/x86-64-linux-tkill.test | FileCheck %s
+
+thread list
+# CHECK: * thread #1, name = 'tkill.out', stop reason = SIGSEGV: sent by tkill system call (sender pid=649752, uid=2667987)