Commits on Jul 11, 2024

1. Remove extern "wasm" ABI …

   Remove the unstable `extern "wasm"` ABI (`wasm_abi` feature tracked
   in rust-lang#83788).
   
   As discussed in rust-lang#127513 (comment)
   and following, this ABI is a failed experiment that did not end
   up being used for anything. Keeping support for this ABI in LLVM 19
   would require us to switch wasm targets to the `experimental-mv`
   ABI, which we do not want to do.
   
   It should be noted that `Abi::Wasm` was internally used for two
   things: The `-Z wasm-c-abi=legacy` ABI that is still used by
   default on some wasm targets, and the `extern "wasm"` ABI. Despite
   both being `Abi::Wasm` internally, they were not the same. An
   explicit `extern "wasm"` additionally enabled the `+multivalue`
   feature.
   
   I've opted to remove `Abi::Wasm` in this patch entirely, instead
   of keeping it as an ABI with only internal usage. Both
   `-Z wasm-c-abi` variants are now treated as part of the normal
   C ABI, just with different different treatment in
   adjust_for_foreign_abi.

   

   nikic committed Jul 11, 2024
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