[WebAssembly] Update grow_memory's return type.

The grow_memory instruction now returns the previous memory size. Add the
return type to the LLVM intrinsic.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292322 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed