[AArch64/GCC][8/N] Refactor code out into 'aarch64_next_callee_save'

[Jiong Wang]

This patch refactor the inner loop out into "aarch64_next_callee_save",
and simplify the code logic and reduce indent.

*no functional change*

ok to install?

thanks.

gcc/
   * config/aarch64/aarch64.c (aarch64_next_callee_save): New function.
   (aarch64_save_or_restore_fprs): Use aarch64_next_callee_save.
   (aarch64_save_or_restore_callee_save_registers): Likewise.
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