readelf: Warn, don't assert, if loclist or rangelist offset is too big.

readelf: Warn, don't assert, if loclist or rangelist offset is too big.

We use a couple of bits to keep track of the addr size, dwarf size and
warning given for a loclist or rangelist offset. Normally offset won't
be that big and will fit in 61-bits easily. But if not, don't assert,
but just warn we don't handle such large offsets.

Signed-off-by: Mark Wielaard <mjw@redhat.com>