Auto merge of rust-lang#14063 - Veykril:proc-macro-abi-1-58, r=Veykril

feat: Remove support for 1.58 proc-macro abi

This seems old enough that we can drop the support for it now, the less ABIs we have the less work it is adjusting our span implementation.

Extracted from rust-lang/rust-analyzer#14061, will rebase that over this once merged.

Author: bors