ams: avoid UB infinite loops

libraries/libmesosphere/source/board/nintendo/nx/kern_k_system_control.cpp

@@ -517,7 +517,7 @@ namespace ams::kern::board::nintendo::nx {
         }
         u32 dummy;
         smc::init::ReadWriteRegister(std::addressof(dummy), 0x7000E400, 0x10, 0x10);
-        while (true) { /* ... */ }
+        AMS_INFINITE_LOOP();
     }
 
     /* User access. */

libraries/libmesosphere/source/board/nintendo/nx/kern_secure_monitor.cpp

@@ -227,7 +227,7 @@ namespace ams::kern::board::nintendo::nx::smc {
     void NORETURN Panic(u32 color) {
         SecureMonitorArguments args = { FunctionId_Panic, color };
         CallPrivilegedSecureMonitorFunction(args);
-        while (true) { /* ... */ }
+        AMS_INFINITE_LOOP();
     }
 
     void CallSecureMonitorFromUser(ams::svc::lp64::SecureMonitorArguments *args) {

libraries/libmesosphere/source/kern_main.cpp

@@ -139,7 +139,7 @@ namespace ams::kern {
 
         /* Main() is done, and we should never get to this point. */
         MESOSPHERE_PANIC("Main Thread continued after exit.");
-        while (true) { /* ... */ }
+        AMS_INFINITE_LOOP();
     }
 
 }