Rollup merge of #98165 - WaffleLapkin:once_things_renamings, r=m-ou-se

once cell renamings

This PR does the renamings proposed in https://github.com/rust-lang/rust/issues/74465#issuecomment-1153703128

- Move/rename `lazy::{OnceCell, Lazy}` to `cell::{OnceCell, LazyCell}`
- Move/rename `lazy::{SyncOnceCell, SyncLazy}` to `sync::{OnceLock, LazyLock}`

(I used `Lazy...` instead of `...Lazy` as it seems to be more consistent, easier to pronounce, etc)

```@rustbot``` label +T-libs-api -T-libs

compiler/rustc_mir_dataflow/src/framework/graphviz.rs

@@ -1,7 +1,7 @@
 //! A helpful diagram for debugging dataflow problems.
 
 use std::borrow::Cow;
-use std::lazy::SyncOnceCell;
+use std::sync::OnceLock;
 use std::{io, ops, str};
 
 use regex::Regex;
@@ -590,7 +590,7 @@ where
 
 macro_rules! regex {
     ($re:literal $(,)?) => {{
-        static RE: SyncOnceCell<regex::Regex> = SyncOnceCell::new();
+        static RE: OnceLock<regex::Regex> = OnceLock::new();
         RE.get_or_init(|| Regex::new($re).unwrap())
     }};
 }