Rollup merge of #72581 - samrat:allow-desugared-break-in-labeled-block, r=davidtwco

Allow unlabeled breaks from desugared `?` in labeled blocks

`?` is desugared into a `break` targeting the innermost `try` scope in which it resides. The `break` however will not have a label. https://github.com/rust-lang/rust/blob/master/src/librustc_ast_lowering/expr.rs#L1560

Since the `target` of the `break` is known, the compiler should not complain about an unlabeled jump for `break`s desugared from `?`.

Closes https://github.com/rust-lang/rust/issues/72483

src/test/ui/label/label_break_value_desugared_break.rs

@@ -0,0 +1,12 @@
+// compile-flags: --edition 2018
+#![feature(label_break_value, try_blocks)]
+
+// run-pass
+fn main() {
+    let _: Result<(), ()> = try {
+        'foo: {
+            Err(())?;
+            break 'foo;
+        }
+    };
+}