[PATCH][Binutils][GAS] arm: Add unwind support for mixed register lists

[Nick Clifton]

Hi Victor,

> This patch extends support for the encoding of the Return Address Authentication pseudo-register in lists containing other register types - e.g. '.save {r4,ra_auth_code,lr}'.
> Lists are broken down into sub-lists allowing assembler to emit the correct new pacbti unwind opcode for the RA_AUTH_CODE pseudo register.

Patch approved and applied.

Cheers
   Nick