This directory contains tests from upstream proposals that either
are not yet in the testsuite repo, or are in a verion of the testsuite
repo that we do not yet support/import.

wide-arithmetic.wast comes from:
https://github.com/WebAssembly/testsuite/tree/main/proposals/wide-arithmetic

This can be deleted on once we import the latest version of testsuite repo
that includes this test.