Kernel: RangeAllocator randomized correctly check if size is in bound. (

SerenityOS#5164)

The random address proposals were not checked with the size so it was
increasely likely to try to allocate outside of available space with
larger and larger sizes.

Now they will be ignored instead of triggering a Kernel assertion
failure.

This is a continuation of: c8e7baf

Kernel/VM/RangeAllocator.cpp

@@ -108,7 +108,7 @@ Optional<Range> RangeAllocator::allocate_randomized(size_t size, size_t alignmen
  VirtualAddress random_address { get_good_random<FlatPtr>() };
  random_address.mask(PAGE_MASK);
 
- if (!m_total_range.contains(random_address))
+ if (!m_total_range.contains(random_address, size))
  continue;
 
  auto range = allocate_specific(random_address, size);