Auto merge of #116269 - Veykril:rustc-abi, r=WaffleLapkin

Bring back generic parameters for indices in rustc_abi and make it compile on stable

This effectively reverses rust-lang/rust#107163, allowing rust-analyzer to depend on this crate again,

It also moves some glob imports / expands them in the first commit because they made it more difficult for me to reason about things.

Author: bors