fix(hir): non-class statement-semantics test262 remnant

[proggeramlug]

Cleans up the non-class statement tail of the test262 language/statements suite. Three root-cause fixes, +7 tests, zero regressions.

Results

Verified against main (bea4f5c) byte-for-byte vs node v26:

• All 16 language/statements dirs (non-class): 1286 → 1293 pass (+7), parity 93.9% → 94.4%, 0 regressions.
• Broad built-ins language --shard 0/12 cross-check: 0 regressions (+2 within the shard slice).
• cargo test -p perry-hir: all green.

Fixed: do-while/S12.6.1_A10, while/S12.6.2_A10, for-of/iterator-close-via-throw, for-of/generator-close-via-throw, function/S13.2_A4_T1, function/S13.2_A4_T2, function/13.2-17-1.

Root causes

1. typeof(x) with a parenthesized operand

The typeof AST-level folds matched a bare Ident/Member, so typeof(zzz) (parens) bypassed them and fell through to a normal operand lowering — emitting a ReferenceError-throwing get instead of folding an unresolved identifier to "undefined" (spec GetValue-is-skipped-under-typeof). Peel transparent Paren wrappers before the folds run.

2. for-of IteratorClose on a throw completion

The lazy iterator-protocol loop ran IteratorClose for break/return/labeled abrupts (insert_iterator_close_on_abrupt) but not when the body completed abruptly via a throw — an explicit throw, a throwing LHS setter, a destructuring error, an assertion failure, or a generator .throw(). Wrap only the user body in a try/catch that runs an unvalidated, exception-swallowing IteratorClose and re-throws the caught error. The element-.value read and binding statements stay outside the wrapper, because per spec IteratorValue throwing sets the iterator done without closing it (iterator-next-result-value-attr-error). The close itself — including the .return getter read — is inside a swallowing try so a throwing return/getter does not replace the original error (iterator-close-throw-get-method-abrupt). Applied to both for-of lowering paths (module-init stmt_loops.rs and body/block body_stmt.rs).

3. f.prototype.constructor returned undefined

The inline nested read folds to HIR GetFunctionPrototypeMethod, whose runtime entry (js_get_function_prototype_method) only served registered prototype methods plus a small builtin-method allowlist — it returned undefined for "constructor" and never materialized the prototype object (so the synthetic class id was 0). Add a constructor arm that routes through js_function_prototype_value_for_read (which respects a replaced f.prototype = X and otherwise materializes the auto-created prototype whose constructor back-pointer is the function) and reads its constructor field.

Files

• crates/perry-hir/src/lower/lower_expr.rs — typeof paren-peel
• crates/perry-hir/src/lower/stmt_loops.rs, lower_decl/body_stmt.rs, lower/mod.rs — for-of IteratorClose-on-throw
• crates/perry-runtime/src/object/class_registry.rs — f.prototype.constructor

No version/CHANGELOG bump (maintainer folds those in at merge).