Rollup merge of #151558 - mejrs:port_on_unimplemented, r=jdonszelmann,jonathanbrouwer

Port diagnostic attributes

*[View all comments](https://triagebot.infra.rust-lang.org/gh-comments/rust-lang/rust/pull/151558)*

Ports all the diagnostic attributes: on_const, on_unimplemented and rustc_on_unimplemented.

I thought about migrating them one by one but that would leave a lot of code duplicated. So this PR looks big but it's mostly a lot of moving code around with slight modifications.

r? @JonathanBrouwer

cc @jdonszelmann feel free to review if you want, not sure which of you wants it.

Author: JonathanBrouwer

Cargo.lock

@@ -3548,6 +3548,7 @@ dependencies = [
  "rustc_lexer",
  "rustc_macros",
  "rustc_parse",
+ "rustc_parse_format",
  "rustc_session",
  "rustc_span",
  "rustc_target",
@@ -4682,7 +4683,6 @@ dependencies = [
  "rustc_macros",
  "rustc_middle",
  "rustc_next_trait_solver",
- "rustc_parse_format",
  "rustc_session",
  "rustc_span",
  "rustc_transmute",

compiler/rustc_attr_parsing/Cargo.toml

@@ -15,6 +15,7 @@ rustc_hir = { path = "../rustc_hir" }
 rustc_lexer = { path = "../rustc_lexer" }
 rustc_macros = { path = "../rustc_macros" }
 rustc_parse = { path = "../rustc_parse" }
+rustc_parse_format = { path = "../rustc_parse_format" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 rustc_target = { path = "../rustc_target" }