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James Molloy 2b8933c354 Teach the SLP Vectorizer that keeping some values live over a callsite can have a cost. 
Some types, such as 128-bit vector types on AArch64, don't have any callee-saved registers. So if a value needs to stay live over a callsite, it must be spilled and refilled. This cost is now taken into account.

llvm-svn: 214859
 2014-08-05 12:30:34 +00:00