Reapply: [Host.mm] Check for the right macro instead of inlining it

Previously, this was reverted in bf65f19 becuase it checked whether
TARGET_OS_EMBEDDED is defined, but that macro is always defined.

Update the condition to check that TARGET_OS_OSX is true.

Author: vedantk

lldb/source/Host/macosx/objcxx/Host.mm

@@ -9,13 +9,9 @@
 #include "lldb/Host/Host.h"
 
 #include <AvailabilityMacros.h>
+#include <TargetConditionals.h>
 
-// On device doesn't have supporty for XPC.
-#if defined(__APPLE__) && (defined(__arm64__) || defined(__aarch64__))
-#define NO_XPC_SERVICES 1
-#endif
-
-#if !defined(NO_XPC_SERVICES)
+#if TARGET_OS_OSX
 #define __XPC_PRIVATE_H__
 #include <xpc/xpc.h>
 
@@ -135,6 +131,8 @@
   return false;
 }
 
+#if TARGET_OS_OSX
+
 static void *AcceptPIDFromInferior(void *arg) {
   const char *connect_url = (const char *)arg;
   ConnectionFileDescriptor file_conn;
@@ -153,8 +151,6 @@
   return NULL;
 }
 
-#if !defined(__arm__) && !defined(__arm64__) && !defined(__aarch64__)
-
 const char *applscript_in_new_tty = "tell application \"Terminal\"\n"
                                     "   activate\n"
                                     "	do script \"/bin/bash -c '%s';exit\"\n"
@@ -307,13 +303,13 @@ repeat with the_window in (get windows)\n\
   return error;
 }
 
-#endif // #if !defined(__arm__) && !defined(__arm64__) && !defined(__aarch64__)
+#endif // TARGET_OS_OSX
 
 bool Host::OpenFileInExternalEditor(const FileSpec &file_spec,
                                     uint32_t line_no) {
-#if defined(__arm__) || defined(__arm64__) || defined(__aarch64__)
+#if !TARGET_OS_OSX
   return false;
-#else
+#else // !TARGET_OS_OSX
   // We attach this to an 'odoc' event to specify a particular selection
   typedef struct {
     int16_t reserved0; // must be zero
@@ -404,7 +400,7 @@ repeat with the_window in (get windows)\n\
   }
 
   return true;
-#endif // #if !defined(__arm__) && !defined(__arm64__) && !defined(__aarch64__)
+#endif // TARGET_OS_OSX
 }
 
 Environment Host::GetEnvironment() { return Environment(*_NSGetEnviron()); }
@@ -689,7 +685,7 @@ static bool GetMacOSXProcessUserAndGroup(ProcessInstanceInfo &process_info) {
   return false;
 }
 
-#if !NO_XPC_SERVICES
+#if TARGET_OS_OSX
 static void PackageXPCArguments(xpc_object_t message, const char *prefix,
                                 const Args &args) {
   size_t count = args.GetArgumentCount();
@@ -841,7 +837,7 @@ static short GetPosixspawnFlags(const ProcessLaunchInfo &launch_info) {
 static Status LaunchProcessXPC(const char *exe_path,
                                ProcessLaunchInfo &launch_info,
                                lldb::pid_t &pid) {
-#if !NO_XPC_SERVICES
+#if TARGET_OS_OSX
   Status error = getXPCAuthorization(launch_info);
   if (error.Fail())
     return error;
@@ -1194,7 +1190,7 @@ static Status LaunchProcessPosixSpawn(const char *exe_path,
 static bool ShouldLaunchUsingXPC(ProcessLaunchInfo &launch_info) {
   bool result = false;
 
-#if !NO_XPC_SERVICES
+#if TARGET_OS_OSX
   bool launchingAsRoot = launch_info.GetUserID() == 0;
   bool currentUserIsRoot = HostInfo::GetEffectiveUserID() == 0;
 
@@ -1226,7 +1222,7 @@ static bool ShouldLaunchUsingXPC(ProcessLaunchInfo &launch_info) {
   }
 
   if (launch_info.GetFlags().Test(eLaunchFlagLaunchInTTY)) {
-#if !defined(__arm__) && !defined(__arm64__) && !defined(__aarch64__)
+#if TARGET_OS_OSX
     return LaunchInNewTerminalWithAppleScript(exe_spec.GetPath().c_str(),
                                               launch_info);
 #else