[WebAssembly] Add test for event section order change

Summary:
This adds a test for D76752. Now the global section comes after the
event section, and this change makes sure it is satisfied.

Reviewers: sbc100, tlively

Reviewed By: tlively

Subscribers: dschuff, jgravelle-google, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D76823