Rollup merge of rust-lang#141610 - BoxyUwU:stabilize_generic_arg_infer, r=lcnr,traviscross

Stabilize `feature(generic_arg_infer)`

Fixes rust-lang#85077

r? lcnr

cc ````@rust-lang/project-const-generics````

Author: Kobzol

core/src/lib.rs

@@ -153,7 +153,6 @@
 #![feature(f16)]
 #![feature(freeze_impls)]
 #![feature(fundamental)]
-#![feature(generic_arg_infer)]
 #![feature(if_let_guard)]
 #![feature(intra_doc_pointers)]
 #![feature(intrinsics)]