[WebAssembly] Add known failures for wasm object file backend

Subscribers: jfb, dschuff

Differential Revision: https://reviews.llvm.org/D32300

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300859 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed