[lldb][Windows] Fixed Host::Kill() (#99721)

HostProcessWindows::Terminate() correctly uses m_process which type is
process_t (HANDLE) to call ::TerminateProcess(). But Host::Kill() uses a
cast from pid, which is wrong.

This patch fixes #51793

Author: slydiman

lldb/source/Host/windows/Host.cpp

@@ -103,7 +103,9 @@ lldb::thread_t Host::GetCurrentThread() {
 }
 
 void Host::Kill(lldb::pid_t pid, int signo) {
-  TerminateProcess((HANDLE)pid, 1);
+  AutoHandle handle(::OpenProcess(PROCESS_TERMINATE, FALSE, pid), nullptr);
+  if (handle.IsValid())
+    ::TerminateProcess(handle.get(), 1);
 }
 
 const char *Host::GetSignalAsCString(int signo) { return NULL; }

lldb/test/API/functionalities/gdb_remote_client/TestPlatformKill.py

@@ -8,7 +8,6 @@
 
 class TestPlatformKill(GDBRemoteTestBase):
     @skipIfRemote
-    @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr52451")
     def test_kill_different_platform(self):
         """Test connecting to a remote linux platform"""