r193356 - Inliner: Handle readonly attribute per argument when adding memcpy

[Vincent Lejeune]

Hi

I updated the patch so that Inline function now uses an alias analysis to decide whether a readonly argument
requires a memcopy or not.
Although InlineFunction is referenced in Cloning.h, it looks like it is only used by Inliner and PartialInlining,
which make the changes less invasive than I though.

Vincent
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