Kernel: Turn lock ranks into template parameters

This step would ideally not have been necessary (increases amount of
refactoring and templates necessary, which in turn increases build
times), but it gives us a couple of nice properties:
- SpinlockProtected inside Singleton (a very common combination) can now
  obtain any lock rank just via the template parameter. It was not
  previously possible to do this with SingletonInstanceCreator magic.
- SpinlockProtected's lock rank is now mandatory; this is the majority
  of cases and allows us to see where we're still missing proper ranks.
- The type already informs us what lock rank a lock has, which aids code
  readability and (possibly, if gdb cooperates) lock mismatch debugging.
- The rank of a lock can no longer be dynamic, which is not something we
  wanted in the first place (or made use of). Locks randomly changing
  their rank sounds like a disaster waiting to happen.
- In some places, we might be able to statically check that locks are
  taken in the right order (with the right lock rank checking
  implementation) as rank information is fully statically known.

This refactoring even more exposes the fact that Mutex has no lock rank
capabilites, which is not fixed here.

Kernel/Process.h

@@ -238,7 +238,7 @@ public:
         return with_protected_data([](auto& protected_data) { return protected_data.ppid; });
     }
 
-    SpinlockProtected<RefPtr<Jail>>& jail() { return m_attached_jail; }
+    SpinlockProtected<RefPtr<Jail>, LockRank::Process>& jail() { return m_attached_jail; }
 
     NonnullRefPtr<Credentials> credentials() const;
 
@@ -568,8 +568,8 @@ public:
     PerformanceEventBuffer* perf_events() { return m_perf_event_buffer; }
     PerformanceEventBuffer const* perf_events() const { return m_perf_event_buffer; }
 
-    SpinlockProtected<OwnPtr<Memory::AddressSpace>>& address_space() { return m_space; }
-    SpinlockProtected<OwnPtr<Memory::AddressSpace>> const& address_space() const { return m_space; }
+    SpinlockProtected<OwnPtr<Memory::AddressSpace>, LockRank::None>& address_space() { return m_space; }
+    SpinlockProtected<OwnPtr<Memory::AddressSpace>, LockRank::None> const& address_space() const { return m_space; }
 
     VirtualAddress signal_trampoline() const
     {
@@ -666,11 +666,11 @@ private:
 
     NonnullOwnPtr<KString> m_name;
 
-    SpinlockProtected<OwnPtr<Memory::AddressSpace>> m_space;
+    SpinlockProtected<OwnPtr<Memory::AddressSpace>, LockRank::None> m_space;
 
     LockRefPtr<ProcessGroup> m_pg;
 
-    RecursiveSpinlock mutable m_protected_data_lock;
+    RecursiveSpinlock<LockRank::None> mutable m_protected_data_lock;
     AtomicEdgeAction<u32> m_protected_data_refs;
     void protect_data();
     void unprotect_data();
@@ -849,12 +849,12 @@ public:
 private:
     ErrorOr<NonnullRefPtr<Custody>> custody_for_dirfd(int dirfd);
 
-    SpinlockProtected<Thread::ListInProcess>& thread_list() { return m_thread_list; }
-    SpinlockProtected<Thread::ListInProcess> const& thread_list() const { return m_thread_list; }
+    SpinlockProtected<Thread::ListInProcess, LockRank::None>& thread_list() { return m_thread_list; }
+    SpinlockProtected<Thread::ListInProcess, LockRank::None> const& thread_list() const { return m_thread_list; }
 
     ErrorOr<NonnullRefPtr<Thread>> get_thread_from_pid_or_tid(pid_t pid_or_tid, Syscall::SchedulerParametersMode mode);
 
-    SpinlockProtected<Thread::ListInProcess> m_thread_list { LockRank::None };
+    SpinlockProtected<Thread::ListInProcess, LockRank::None> m_thread_list {};
 
     MutexProtected<OpenFileDescriptions> m_fds;
 
@@ -864,9 +864,9 @@ private:
     Atomic<bool, AK::MemoryOrder::memory_order_relaxed> m_is_stopped { false };
     bool m_should_generate_coredump { false };
 
-    SpinlockProtected<RefPtr<Custody>> m_executable;
+    SpinlockProtected<RefPtr<Custody>, LockRank::None> m_executable;
 
-    SpinlockProtected<RefPtr<Custody>> m_current_directory;
+    SpinlockProtected<RefPtr<Custody>, LockRank::None> m_current_directory;
 
     NonnullOwnPtrVector<KString> m_arguments;
     NonnullOwnPtrVector<KString> m_environment;
@@ -876,7 +876,7 @@ private:
     LockWeakPtr<Memory::Region> m_master_tls_region;
 
     IntrusiveListNode<Process> m_jail_list_node;
-    SpinlockProtected<RefPtr<Jail>> m_attached_jail { LockRank::Process };
+    SpinlockProtected<RefPtr<Jail>, LockRank::Process> m_attached_jail {};
 
     size_t m_master_tls_size { 0 };
     size_t m_master_tls_alignment { 0 };
@@ -886,8 +886,8 @@ private:
 
     LockRefPtr<Timer> m_alarm_timer;
 
-    SpinlockProtected<UnveilData> m_unveil_data;
-    SpinlockProtected<UnveilData> m_exec_unveil_data;
+    SpinlockProtected<UnveilData, LockRank::None> m_unveil_data;
+    SpinlockProtected<UnveilData, LockRank::None> m_exec_unveil_data;
 
     OwnPtr<PerformanceEventBuffer> m_perf_event_buffer;
 
@@ -903,7 +903,7 @@ private:
         OwnPtr<KString> value;
     };
 
-    SpinlockProtected<Array<CoredumpProperty, 4>> m_coredump_properties { LockRank::None };
+    SpinlockProtected<Array<CoredumpProperty, 4>, LockRank::None> m_coredump_properties {};
     NonnullLockRefPtrVector<Thread> m_threads_for_coredump;
 
     mutable LockRefPtr<ProcessProcFSTraits> m_procfs_traits;
@@ -920,7 +920,7 @@ private:
 
 public:
     using List = IntrusiveListRelaxedConst<&Process::m_list_node>;
-    static SpinlockProtected<Process::List>& all_instances();
+    static SpinlockProtected<Process::List, LockRank::None>& all_instances();
 };
 
 // Note: Process object should be 2 pages of 4096 bytes each.
@@ -929,7 +929,7 @@ public:
 // The second page is being used exclusively for write-protected values.
 static_assert(AssertSize<Process, (PAGE_SIZE * 2)>());
 
-extern RecursiveSpinlock g_profiling_lock;
+extern RecursiveSpinlock<LockRank::None> g_profiling_lock;
 
 template<IteratorFunction<Thread&> Callback>
 inline IterationDecision Process::for_each_thread(Callback callback)