Revision 1646729

- Fix the ARM assembler to generate a Realtime profile for armv8-r [PR 25992]
- Prevent a potential use-after-fee memory corruption bug in the linker
  (for PE format files) [PR 25993]
- gas: Fix checking for backwards .org with negative offset
- aarch64: set sh_entsize of .plt to 0
- x86: Properly merge -z ibt and -z shstk