Andrew Trick a51d74fc35 Set NSW/NUW flags on SCEVAddExpr when the operation is flagged as ...

such.

I'm doing this now for completeness because I can't think of/remember
any reason that it was left out. I'm not sure it will help anything,
but if we don't do it we need to explain why in comments.

llvm-svn: 139450

2011-09-10 01:09:50 +00:00

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