Rollup merge of #133424 - Nadrieril:guard-patterns-parsing, r=fee1-dead

Parse guard patterns

This implements the parsing of [RFC3637 Guard Patterns](https://rust-lang.github.io/rfcs/3637-guard-patterns.html) (see also [tracking issue](https://github.com/rust-lang/rust/issues/129967)). This PR is extracted from https://github.com/rust-lang/rust/pull/129996 with minor modifications.

cc `@max-niederman`

compiler/rustc_passes/src/input_stats.rs

@@ -555,6 +555,7 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
             Slice,
             Rest,
             Never,
+            Guard,
             Paren,
             MacCall,
             Err