[v3][patch] ARM EABI tweaks for vector constructors

[Mark Mitchell]

Paul Brook wrote:

>The ARM EABI says that __cxa_vec_ctor and __cxa_vec_cctor should return their 
>first argument. Patch below implements this.
>
>Built i686-linux and Tested with cross to arm-none-elf.
>Ok?
>
OK.

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Mark Mitchell
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