[3.12] gh-111046: for wasi-threads, export memory as well via the linker (GH-111099) (GH-111141)

gh-111046: for wasi-threads, export memory as well via the linker (GH-111099)
(cherry picked from commit 5dfa71769f547fffa893a89b0b04d963a41b2441)

Co-authored-by: YAMAMOTO Takashi <yamamoto@midokura.com>