[LLVMdev] PATCH allow for promoting any size struct arguments

[Matthijs Kooijman]

Hi,

the ArgumentPromotion pass replaces aggregrate function arguments by multiple
individual arguments. The default pass only does this when the aggregrate has
3 or less elements, otherwise the code will be unchanged.

I have a need to always promote aggregrate arguments, even when there are a
lot of them.

The attached patch adds a "maxElements" argument to ArgPromotion's constructor
and to createArgumentPromotionPass with a default value of 3 to preserve the
original behaviour.

Please review and commit this patch.

Gr.

Matthijs
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