The LLVM codegen doesn't support the wasm target

Right now, the LLVM codegen doesn't support the wasm target yet, it would fail with:

<no location info>: error:
    panic! (the 'impossible' happened)
  GHC version 9.7.20230201:
	Failed to lookup LLVM data layout
  Target: wasm32-unknown-wasi
  Available targets:

Thus this tracking ticket. Marking this as a low-priority feature request instead of a bug at the moment. It'll take some time to look into the LLVM codegen logic and figure out how to teach the wasm NCG's calling convention to it.

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