[BOLT] Fix misc issues in relocation mode.

Summary:
Fix issues discovered while testing LTO mode with bfd linker:

  * Correctly update absolute function references from code
    with addend.
  * Support .got.plt section generated by bfd linker.
  * Support quirks of .tbss section.
  * Don't ignore functions if the size in FDE doesn't match the
    size in the symbol table. Instead keep processing using the
    maximum indicated size.

(cherry picked from FBD5178831)