[release/9.0-staging] [mono] Switch generic instance cache back to GHashTable; improve ginst hash function#113316

steveisok merged 2 commits intorelease/9.0-stagingdotnet/runtime:release/9.0-stagingfrom

backport/pr-113287-to-release/9.0-stagingdotnet/runtime:backport/pr-113287-to-release/9.0-stagingCopy head branch name to clipboard