[clang] [libunwind] [llvm] [wasm] Toolchain support for `wasm32-wali-linux-musl` target (PR #156087)

[Jon Chesterfield via cfe-commits]

JonChesterfield wrote:

Wasm + musl running on Linux is a good thing. Does this run well enough that we can self host on it? I.e. build clang to the target.

I'm not clear why this is especially associated with rust - looks frontend language independent at first sight.

https://github.com/llvm/llvm-project/pull/156087