Hi all,

while debugging something unrelated I noticed a minor optimisation we
can make to __syscall_cp_asm for arm.

Unless I'm missing something the only reason we needed to preserve the
link register was because we were using a branch-link instruction to
branch to __cp_cancel. Replacing this with a branch means we can avoid
the save/restore as the link register is no longer modified.

Patch attached.

Kind regards,

Patrick