runtime: SIGSEGV in native-constructor-identity test (new BigInt()/Symbol())

[proggeramlug]

Summary

SIGSEGV (exit 139) running test/js/bun/jsc/native-constructor-identity.test.ts from Bun's suite. Pre-existing — reproduces on a clean main build.

Repro

The file asserts that call-only builtins throw when new-ed:

expect(() => new (BigInt as any)(1)).toThrow(TypeError);
expect(() => new (Symbol as any)("x")).toThrow(TypeError);

The file SIGSEGVs (not yet minimized). Likely new BigInt(...) / new Symbol(...) (constructing a non-constructable builtin) or the expect.any(Ctor) path.

Found via running Bun's own test suite through perry.

[proggeramlug]

Fixed by #6244 (merged) — same root cause as #6240: string/JSON coercion of a fetch/Blob handle dereferenced the synthetic band id. String(new Blob()), JSON.stringify(new Request()) etc. no longer SIGSEGV; the native-constructor-identity test now runs.