Rollup merge of #134989 - max-niederman:guard-patterns-hir, r=oli-obk

Lower Guard Patterns to HIR.

Implements lowering of [guard patterns](https://rust-lang.github.io/rfcs/3637-guard-patterns.html) (see the [tracking issue](#129967)) to HIR.

compiler/rustc_passes/src/input_stats.rs

@@ -305,6 +305,7 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
             Deref,
             Ref,
             Lit,
+            Guard,
             Range,
             Slice,
             Err