[llvm] [WebAssembly] Fix lowering of (extending) loads from addrspace(1) globals (PR #155937)

[Sam Parker via llvm-commits]

sparker-arm wrote:

> once I adjust setLoadExtAction to address space 1, it starts failing. The Custom handler is never called.

Thanks for trying! I guess it would help if I had fixed up the call sites in the legalizer...

https://github.com/llvm/llvm-project/pull/155937