-- v2: ntdll: Split RtlSizeHeap to a separate heap_size helper. ntdll: Split RtlReAllocateHeap to a separate heap_reallocate helper. ntdll: Split RtlFreeHeap to a separate heap_free helper. ntdll: Split RtlAllocateHeap to a separate heap_allocate helper. ntdll: Split HEAP_IsRealArena to heap_validate and heap_validate_ptr. ntdll: Lock heap critical section outside of HEAP_IsRealArena.