[WebAssembly] Delete a specific push number from test expectations

Summary:
This shouldn't have been a specific number but rather a regex. This was
a part of rL339474 which got reverted.

Reviewers: aardappel

Subscribers: dschuff, sbc100, jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D50728

llvm-svn: 339736