[spectec] Wasm 1.0: `$growmemory` does not enforce the page limit

[lzy0505]

The Wasm 1.0 execution rule for memory.grow succeeds only if the resulting memory size is no greater than 2^16 pages.

The official WebAssembly Specification, Release 1.0 PDF states:

“If len is larger than 2¹⁶, then fail.”

growmem includes:

len ≤ 2¹⁶

Currently the spectec rule is:

def $growmemory(mi, n) = mi'
  -- if mi = { TYPE `[i .. j?], BYTES b* }
  -- if i' = $(|b*| / (64 * $Ki) + n)
  -- if mi' = { TYPE `[i' .. j?], BYTES b* 0^(n * $($(64 * $Ki))) }
  -- (if i' <= j)?

It is missing the condition -- if $(i' <= 65536)