kernel: Make some functions const

src/core/hle/kernel/kernel.cpp

@@ -37,7 +37,7 @@ Handle ObjectPool::Create(Object* obj, int range_bottom, int range_top) {
     return 0;
 }
 
-bool ObjectPool::IsValid(Handle handle) {
+bool ObjectPool::IsValid(Handle handle) const {
     int index = handle - HANDLE_OFFSET;
     if (index < 0)
         return false;
@@ -75,7 +75,7 @@ void ObjectPool::List() {
     }
 }
 
-int ObjectPool::GetCount() {
+int ObjectPool::GetCount() const {
     int count = 0;
     for (int i = 0; i < MAX_COUNT; i++) {
         if (occupied[i])

src/core/hle/kernel/kernel.h

@@ -86,7 +86,7 @@ public:
         }
     }
 
-    bool IsValid(Handle handle);
+    bool IsValid(Handle handle) const;
 
     template <class T>
     T* Get(Handle handle) {
@@ -142,7 +142,7 @@ public:
     Object* &operator [](Handle handle);
     void List();
     void Clear();
-    int GetCount();
+    int GetCount() const;
 
 private: