[clang] [llvm] [WebAssembly] Change to 64-bit table indices on Wasm64 (PR #180649)

[Demetrius Kanios via cfe-commits]

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QuantumSegfault wrote:

I'm not quite sure where the line is drawn.

It's sort of codegen in the sense that it is testing part of `llc` rather than `llvm-mc`. However similar to other `.ll` files in this directory I have some IR constructs I'm ensuring are being transformed and emitted into the WASM object file correctly.

https://github.com/llvm/llvm-project/pull/180649