Auto merge of #16507 - clubby789:remove-ffi_returns_twice, r=lnicola

Remove `ffi_returns_twice` references

This feature has just been [removed](rust-lang/rust#120502)

Author: bors

crates/hir-def/src/attr/builtin.rs

@@ -283,9 +283,6 @@ pub const INERT_ATTRIBUTES: &[BuiltinAttribute] = &[
         experimental!(optimize),
     ),
 
-    gated!(
-        ffi_returns_twice, Normal, template!(Word), WarnFollowing, experimental!(ffi_returns_twice)
-    ),
     gated!(ffi_pure, Normal, template!(Word), WarnFollowing, experimental!(ffi_pure)),
     gated!(ffi_const, Normal, template!(Word), WarnFollowing, experimental!(ffi_const)),
     gated!(

crates/ide-db/src/generated/lints.rs

@@ -5044,17 +5044,6 @@ against are compatible with those of the `#[ffi_pure]`.
 [ARM C/C++ compiler]: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491c/Cacigdac.html
 [GCC]: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-pure-function-attribute
 [IBM ILE C/C++]: https://www.ibm.com/support/knowledgecenter/fr/ssw_ibm_i_71/rzarg/fn_attrib_pure.htm
-"##,
-    },
-    Lint {
-        label: "ffi_returns_twice",
-        description: r##"# `ffi_returns_twice`
-
-The tracking issue for this feature is: [#58314]
-
-[#58314]: https://github.com/rust-lang/rust/issues/58314
-
-------------------------
 "##,
     },
     Lint {