Patch to force SuitableAlign's alignment when loading on object with larger alignment

[jahanian]

This patch enforces SuitableAlign’s alignment when loading objects with more relaxed alignment. Currently, SuitableAlign is used in a
warning when type is over aligned. This patch optionally enforces this in IRGen. I defined a new field in TargetInfo which is optionally set to
SuitableAlign. Currently, this is only defined for Apple’s targets as I don’t know its implication for all other supported targets. Long term,
we want to use one value for both (Sema and code gen). This is rdar://16254558

	

- Fariborz


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