[WebAssembly] Test change after disabling MachineBlockPlacement

Summary:
We disabled MachineBlockPlacement pass in D58953, and this test result
changes as the result of it.

Reviewers: kripken

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

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58954

llvm-svn: 355438