[WebAssembly] Don't old negative load/store offsets in fast-isel.

WebAssembly's load/store offsets are unsigned and don't wrap, so it's not
valid to fold in a negative offset.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290342 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed