Make better use of the static MemorySegment::allocateNative factories. Since MemorySession implements SegmentAllocator, clients now have two ways to allocate segments in a session:

MemorySegment.allocateNative(100, session); // 1
session.allocate(100); // 2

Instead of having two ways of doing the same thing, we could instead re-wire the static factories in MemorySegment to create a segment using a new implicit session:

MemorySegment.allocateNative(100); // shortcut for MemorySession.openImplicit().allocate(100);

This mimics the ByteBuffer API (e.g. ByteBuffer::allocateDirect), making the static factory an ideal starting point for developers looking to replace existing usages of direct buffers with memory segments. At the same time, since the factory doesn’t accept any session parameter, developers don’t have to worry about temporal bounds if they don’t need to.