Drop the OS from the WebAssembly target triple for now.

This unbreaks TripleTest.Normalization. We'll have to come up with a new
plan for the OS component of the target triple for WebAssembly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241041 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed