`#[aapcs_on_arm]` is applied to two functions with no floating point

[AaronKutch]

In PR #332 and in my upcoming PR for fixing issue #367, I have noticed two functions, __multi3 and __divmoddi4, which have #[aapcs_on_arm] for no apparent reason. Amanieu said that all it does is force soft-float convention even on hard-float targets. I checked the arm part of compiler-rt and don't see anything unusual with those functions. Those two functions are the only non-floating-point related functions with #[aapcs_on_arm] on them. Can I remove those two instances of #[aapcs_on_arm] in my two PRs?

[alexcrichton]

These are likely a mistake. IIRC we copied this mostly from compiler-rt, but even there it may have been a mistake or we mistakenly copied something over. Should be fine to fix!

[AaronKutch]

Ok just double checking, I will close this issue once both are fixed