[BOLT] Update addresses for DW_TAG_GNU_call_site and DW_TAG_label.

Summary:
Some DWARF tags (such as GNU_call_site and label) reference instruction
addresses in the input binary. When we update debug info we need to
update these tags too with new addresses.

Also fix base address used for calculation of output addresses in
relocation mode.

(cherry picked from FBD5155814)