OSV-2022-550 Heap-use-after-free in mrb_bint_new_str

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=48873 Crash type: Heap-use-after-free READ 1 Crash state: mrbbintnewstr mrbvmexec mrbvmrun...