Fix PR15293: ARM codegen ice - expected larger existing stack allocation

[Renato Golin]

On 28 March 2013 17:34, Bob Wilson <bob.wilson at apple.com> wrote:

> Manman reenabled struct byval for ARM in clang svn r161790.  I'm not aware
> of any problems with it now.
>

Hi Bob,

That's weird, I just compiled a simple example and got the array cast, have
you seen the attachments earlier? Even when I change the structure to fit
in the first four registers, the code lowered is similar and the IR
coalesce to an array.

cheers,
--renato
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