(_UPT_find_proc_info): On ia64, when returning info about the kernel's unwind
table, copy the unwind info into a malloc'd buffer and use
unw_local_addr_space to search the table, since the table is stored
in local memory.
(Logical change 1.71)
Adjust for the fact that the image info is now tracked by "struct elf_image".
(elf64_valid_object): Delete (it's now in elfxx.c.
(_UPTi_find_uwnind_table): Don't mmap the image here.
(get_unwind_info): Use tdep_get_elf_image() to obtain the ELF image.
(Logical change 1.45)