[v3,arm] Modify vec helper function return value

[Mark Mitchell]

Paul Brook wrote:

>The patch below makes the __cxa_vec_ctor and __cxa_vec_cctor return their 
>first argument, as specified by the ARM EABI.
>
>Tested with cross to arm-none-elf and bootstrapped i686-linux
>Ok?
>
OK.

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Mark Mitchell
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