Nikita Popov 900578d1c1 [SimplifyIndVar] Refactor overflow check elimination code; NFC ...

Extract a willNotOverflow() helper function that is shared between
eliminateOverflowIntrinsic() and strengthenOverflowingOperation().
Use WithOverflowInst for the former.

We'll be able to reuse the same code for saturating intrinsics as
well.

llvm-svn: 362305

2019-06-01 20:21:53 +00:00

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