[WebAssembly] Update know failures for the wasm waterfall

Summary:
The waterfall no longer builds .s files and no longers uses
the wasm-o when it builds object files.

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

Differential Revision: https://reviews.llvm.org/D48371

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335135 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed