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

[via llvm-commits]

QuantumSegfault wrote:

I just tried it, and it doesn't quite work. It doesn't BREAK anything off the bat (behavior is the same as before, as expected), but once I adjust setLoadExtAction to address space 1, it starts failing. The Custom handler is never called.

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