[lld] [lld][WebAssembly] Add `GOT.mem` for `WASM_MEMORY_ADDR_REL_` of Shared Data (PR #104920)

[Luc Blaeser via llvm-commits]

luc-blaeser wrote:

Thanks for following up. I was thinking of a case where a pointer to static data of DSO would be exported. But then the codegen should not use approach (2) if I understand correctly. 

https://github.com/llvm/llvm-project/pull/104920