Memory64 lowering fails with 64bit offset

[brendandahl]

wasm-opt --memory64-lowering --table64-lowering /tmp/emscripten_temp/tsgen.wasm -o /tmp/emscripten_temp/tsgen.wasm --mvp-features --enable-threads --enable-bulk-memory --enable-bulk-memory-opt --enable-call-indirect-overlong --enable-memory64 --enable-multivalue --enable-mutable-globals --enable-nontrapping-float-to-int --enable-reference-types --enable-sign-ext

[wasm-validator error in function 581] unexpected false: offset must be u32, on 
(i32.load offset=17179869180
 (i32.wrap_i64
  (local.tee $4
   (i64.load offset=56
    (i32.wrap_i64
     (local.get $4)
    )
   )
  )
 )
)
Fatal: error after opts

From: emscripten-core/emscripten#26154

tsgen.wasm.zip

[brendandahl]

Fixed by #8316