Auto merge of #161338 - jhpratt:rollup-gDOZoei, r=jhpratt

Rollup of 18 pull requests

Successful merges:

 - rust-lang/rust#154210 (fix: fix the capture behavior of `if let` in closures)
 - rust-lang/rust#156176 (Initial implementation of `FnPtr` trait)
 - rust-lang/rust#160767 (Unify E0117 foreign-trait label for ADT/primitive types with existing Slice/Array/Tuple handling)
 - rust-lang/rust#161297 (std: use UNIX's `Instant` and `SystemTime` on Hermit)
 - rust-lang/rust#160489 (Adding diagnostic item markers for multiple fs functions and structs)
 - rust-lang/rust#160643 (Require windowed (and exception) for Xtensa ABI)
 - rust-lang/rust#161088 (suppress projection errors already covered by a trait error)
 - rust-lang/rust#161114 (Remove fields from TypeKind: Struct, Enum, Union and Tuple)
 - rust-lang/rust#161115 (Assorted allocator nitpicks)
 - rust-lang/rust#161220 (bootstrap: Allow `./x fix --allow-dirty`)
 - rust-lang/rust#161296 (Enable overflow checks in `rustc_thread_pool`)
 - rust-lang/rust#161298 (remove rustc_error_messages dependency)
 - rust-lang/rust#161304 (Rename test so it matches the issue)
 - rust-lang/rust#161309 (`allow(non_camel_case_types)` in `minicore.rs`)
 - rust-lang/rust#161315 (Relax codgen test variable regex)
 - rust-lang/rust#161318 (Doc: clarify how `Read::bytes` handling Interrupted errors)
 - rust-lang/rust#161321 (Update books)
 - rust-lang/rust#161335 ([compiletest] Use the correct rustc lib directory for query_rustc_output)