Fix accounting of offsets in unadjusted_ptr_and_unit_offset
unadjusted_ptr_and_unit_offset accidentally throws away the offset computed by
get_addr_base_and_unit_offset. Instead of passing extra_offset it passes offset.
PR ipa/114207
gcc/ChangeLog:
* ipa-prop.cc (unadjusted_ptr_and_unit_offset): Fix accounting of offsets in ADDR_EXPR.