core: Don't handle SIGSEGV if asan is enabled
core: Don't handle SIGSEGV if asan is enabled

Looks like we could just allocate a larger signal stack, but there is
no reason to handle SIGSEGV ourselves when asan will do it.

Signed-off-by: Rafael Ávila de Espíndola <1975039f9046bf513b77c0c5639a0efc25f00e7f@scylladb.com>

avikivity/seastar,dreamsxin/seastar,avikivity/seastar,dreamsxin/seastar,scylladb/seastar,cloudius-systems/seastar,cloudius-systems/seastar,scylladb/seastar,dreamsxin/seastar,syuu1228/seastar,scylladb/seastar,cloudius-systems/seastar,avikivity/seastar,syuu1228/seastar,syuu1228/seastar