OSV-2023-178 Segv on unknown address in mrb_bint_sub

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=57037 Crash type: Segv on unknown address Crash state: mrbbintsub intsub mrbvmexec...

OSV-2022-628 Segv on unknown address in mpz_add

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=49453 Crash type: Segv on unknown address Crash state: mpzadd mpzsub mrbbintsub...