Rollup merge of #82128 - anall:feature/add_diagnostic_items, r=davidtwco

add diagnostic items for OsString/PathBuf/Owned as well as to_vec on slice

This is adding diagnostic items to be used by rust-lang/rust-clippy#6730, but my understanding is the clippy-side change does need to be done over there since I am adding a new clippy feature.

Add diagnostic items to the following types:
  OsString (os_string_type)
  PathBuf (path_buf_type)
  Owned (to_owned_trait)

As well as the to_vec method on slice/[T]

compiler/rustc_span/src/symbol.rs

@@ -169,10 +169,14 @@ symbols! {
         Option,
         Ord,
         Ordering,
+        OsStr,
+        OsString,
         Output,
         Param,
         PartialEq,
         PartialOrd,
+        Path,
+        PathBuf,
         Pending,
         Pin,
         Poll,
@@ -198,6 +202,8 @@ symbols! {
         StructuralPartialEq,
         Sync,
         Target,
+        ToOwned,
+        ToString,
         Try,
         Ty,
         TyCtxt,