[lld] [lld][WebAssembly] Match the ELF linker in transitioning away from archive indexes. (PR #78658)

[Nikita Popov via llvm-commits]

nikic wrote:

The `--fatal-warnings` gets added for wasm targets here:
https://github.com/rust-lang/rust/blob/0e4243538b9119654c22dce688f8a63c81864de9/compiler/rustc_target/src/spec/base/wasm.rs#L41-L43

Should be fine to drop it.

https://github.com/llvm/llvm-project/pull/78658