[WebAssembly] Pass ArrayRef rather than SmallVector

This is more flexible and less verbose.

Differential Revision: https://reviews.llvm.org/D37875

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313384 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed