[WebAssembly] v4f32.abs and v2f64.abs

Summary: implement lowering of @llvm.fabs for vector types.

Reviewers: aheejin, dschuff

Subscribers:

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342513 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed