WebAssembly.Memory-backed ArrayBuffers wrap external
ByteBuffer storage. When that memory grows,
ByteBuffer::try_resize() may realloc the backing storage while
old fixed-length buffer objects remain reachable from JS.
TypedArrayBase cached m_data for all fixed-length buffers, and
the asm interpreter fast path dereferenced that cached pointer
directly. For wasm memory views this could leave a stale
pointer behind across grow().
Restrict cached typed-array data pointers to fixed-length
ArrayBuffers that own stable ByteBuffer storage.
External/unowned buffers, including WebAssembly.Memory
buffers, now keep m_data == nullptr and fall back to code that
re-derives buffer().data() on each access.
Add regressions for both the original shared-memory grow case
and the second-grow stale-view case.
0b9636fadf