Rollup merge of #87170 - xFrednet:clippy-5393-add-diagnostic-items, r=Manishearth,oli-obk

Add diagnostic items for Clippy

This adds a bunch of diagnostic items to `std`/`core`/`alloc` functions, structs and traits used in Clippy. The actual refactorings in Clippy to use these items will be done in a different PR in Clippy after the next sync.

This PR doesn't include all paths Clippy uses, I've only gone through the first 85 lines of Clippy's [`paths.rs`](ecf85f4bdc/clippy_utils/src/paths.rs) (after rust-lang/rust-clippy#7466) to get some feedback early on. I've also decided against adding diagnostic items to methods, as it would be nicer and more scalable to access them in a nicer fashion, like adding a `is_diagnostic_assoc_item(did, sym::Iterator, sym::map)` function or something similar (Suggested by `@camsteffen` [on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/147480-t-compiler.2Fwg-diagnostics/topic/Diagnostic.20Item.20Naming.20Convention.3F/near/225024603))

There seems to be some different naming conventions when it comes to diagnostic items, some use UpperCamelCase (`BinaryHeap`) and some snake_case (`hashmap_type`). This PR uses UpperCamelCase for structs and traits and snake_case with the module name as a prefix for functions. Any feedback on is this welcome.

cc: rust-lang/rust-clippy#5393

r? `@Manishearth`

compiler/rustc_span/src/symbol.rs

@@ -122,10 +122,14 @@ symbols! {
     // nice to have.
     Symbols {
         Alignment,
+        Any,
         Arc,
         Argument,
         ArgumentV1,
         Arguments,
+        AsMut,
+        AsRef,
+        BTreeEntry,
         BTreeMap,
         BTreeSet,
         BinaryHeap,
@@ -139,6 +143,7 @@ symbols! {
         Continue,
         Copy,
         Count,
+        Cow,
         Debug,
         DebugStruct,
         DebugTuple,
@@ -146,12 +151,17 @@ symbols! {
         Decoder,
         Default,
         Deref,
+        DirBuilder,
+        DoubleEndedIterator,
+        Duration,
         Encodable,
         Encoder,
         Eq,
         Equal,
         Err,
         Error,
+        File,
+        FileType,
         FormatSpec,
         Formatter,
         From,
@@ -162,11 +172,14 @@ symbols! {
         GlobalAlloc,
         Hash,
         HashMap,
+        HashMapEntry,
         HashSet,
         Hasher,
         Implied,
         Input,
         IntoIterator,
+        IoRead,
+        IoWrite,
         Is,
         ItemContext,
         Iterator,
@@ -369,6 +382,8 @@ symbols! {
         closure,
         closure_to_fn_coercion,
         cmp,
+        cmp_max,
+        cmp_min,
         cmpxchg16b_target_feature,
         cmse_nonsecure_entry,
         coerce_unsized,
@@ -674,6 +689,7 @@ symbols! {
         item,
         item_like_imports,
         iter,
+        iter_repeat,
         keyword,
         kind,
         kreg,
@@ -740,6 +756,12 @@ symbols! {
         maybe_uninit,
         maybe_uninit_uninit,
         maybe_uninit_zeroed,
+        mem_discriminant,
+        mem_drop,
+        mem_forget,
+        mem_replace,
+        mem_size_of,
+        mem_size_of_val,
         mem_uninitialized,
         mem_zeroed,
         member_constraints,