Auto merge of #84730 - sexxi-goose:rox-auto-trait, r=nikomatsakis

Add auto traits and clone trait migrations for RFC2229

This PR
- renames the existent RFC2229 migration `disjoint_capture_drop_reorder` to `disjoint_capture_migration`
- add additional migrations for auto traits and clone trait

Closes rust-lang/project-rfc-2229#29
Closes rust-lang/project-rfc-2229#28

r? `@nikomatsakis`

compiler/rustc_span/src/symbol.rs

@@ -939,6 +939,7 @@ symbols! {
         receiver,
         recursion_limit,
         reexport_test_harness_main,
+        ref_unwind_safe,
         reference,
         reflect,
         reg,
@@ -1060,6 +1061,7 @@ symbols! {
         self_in_typedefs,
         self_struct_ctor,
         semitransparent,
+        send,
         send_trait,
         shl,
         shl_assign,
@@ -1281,6 +1283,7 @@ symbols! {
         unused_qualifications,
         unwind,
         unwind_attributes,
+        unwind_safe,
         unwrap,
         unwrap_or,
         use_extern_macros,