Everywhere: Rename ASSERT => VERIFY

(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED)

Since all of these checks are done in release builds as well,
let's rename them to VERIFY to prevent confusion, as everyone is
used to assertions being compiled out in release.

We can introduce a new ASSERT macro that is specifically for debug
checks, but I'm doing this wholesale conversion first since we've
accumulated thousands of these already, and it's not immediately
obvious which ones are suitable for ASSERT.

AK/RefPtr.h

@@ -50,7 +50,7 @@ struct RefPtrTraits {
 
     ALWAYS_INLINE static FlatPtr as_bits(T* ptr)
     {
-        ASSERT(!((FlatPtr)ptr & 1));
+        VERIFY(!((FlatPtr)ptr & 1));
         return (FlatPtr)ptr;
     }
 
@@ -70,7 +70,7 @@ struct RefPtrTraits {
     ALWAYS_INLINE static FlatPtr exchange(Atomic<FlatPtr>& atomic_var, FlatPtr new_value)
     {
         // Only exchange when lock is not held
-        ASSERT(!(new_value & 1));
+        VERIFY(!(new_value & 1));
         FlatPtr expected = atomic_var.load(AK::MemoryOrder::memory_order_relaxed);
         for (;;) {
             expected &= ~(FlatPtr)1; // only if lock bit is not set
@@ -86,7 +86,7 @@ struct RefPtrTraits {
     ALWAYS_INLINE static bool exchange_if_null(Atomic<FlatPtr>& atomic_var, FlatPtr new_value)
     {
         // Only exchange when lock is not held
-        ASSERT(!(new_value & 1));
+        VERIFY(!(new_value & 1));
         for (;;) {
             FlatPtr expected = default_null_value; // only if lock bit is not set
             if (atomic_var.compare_exchange_strong(expected, new_value, AK::MemoryOrder::memory_order_acq_rel))
@@ -116,13 +116,13 @@ struct RefPtrTraits {
             Kernel::Processor::wait_check();
 #endif
         }
-        ASSERT(!(bits & 1));
+        VERIFY(!(bits & 1));
         return bits;
     }
 
     ALWAYS_INLINE static void unlock(Atomic<FlatPtr>& atomic_var, FlatPtr new_value)
     {
-        ASSERT(!(new_value & 1));
+        VERIFY(!(new_value & 1));
         atomic_var.store(new_value, AK::MemoryOrder::memory_order_release);
     }
 
@@ -153,14 +153,14 @@ public:
         : m_bits(PtrTraits::as_bits(const_cast<T*>(&object)))
     {
         T* ptr = const_cast<T*>(&object);
-        ASSERT(ptr);
-        ASSERT(!is_null());
+        VERIFY(ptr);
+        VERIFY(!is_null());
         ptr->ref();
     }
     RefPtr(AdoptTag, T& object)
         : m_bits(PtrTraits::as_bits(&object))
     {
-        ASSERT(!is_null());
+        VERIFY(!is_null());
     }
     RefPtr(RefPtr&& other)
         : m_bits(other.leak_ref_raw())
@@ -179,7 +179,7 @@ public:
     ALWAYS_INLINE RefPtr(NonnullRefPtr<U>&& other)
         : m_bits(PtrTraits::as_bits(&other.leak_ref()))
     {
-        ASSERT(!is_null());
+        VERIFY(!is_null());
     }
     template<typename U, typename P = RefPtrTraits<U>>
     RefPtr(RefPtr<U, P>&& other)
@@ -330,7 +330,7 @@ public:
     NonnullRefPtr<T> release_nonnull()
     {
         FlatPtr bits = PtrTraits::exchange(m_bits, PtrTraits::default_null_value);
-        ASSERT(!PtrTraits::is_null(bits));
+        VERIFY(!PtrTraits::is_null(bits));
         return NonnullRefPtr<T>(NonnullRefPtr<T>::Adopt, *PtrTraits::as_ptr(bits));
     }
 
@@ -384,7 +384,7 @@ public:
     {
         // make sure we are holding a null value
         FlatPtr bits = m_bits.load(AK::MemoryOrder::memory_order_relaxed);
-        ASSERT(PtrTraits::is_null(bits));
+        VERIFY(PtrTraits::is_null(bits));
         return PtrTraits::to_null_value(bits);
     }
     template<typename U = T, typename EnableIf<IsSame<U, T>::value && !IsNullPointer<typename PtrTraits::NullType>::value>::Type* = nullptr>
@@ -392,7 +392,7 @@ public:
     {
         // make sure that new null value would be interpreted as a null value
         FlatPtr bits = PtrTraits::from_null_value(value);
-        ASSERT(PtrTraits::is_null(bits));
+        VERIFY(PtrTraits::is_null(bits));
         assign_raw(bits);
     }
 
@@ -454,7 +454,7 @@ private:
 
     ALWAYS_INLINE T* as_nonnull_ptr(FlatPtr bits) const
     {
-        ASSERT(!PtrTraits::is_null(bits));
+        VERIFY(!PtrTraits::is_null(bits));
         return PtrTraits::as_ptr(bits);
     }