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Justin Bogner 7c792839af PM: Check that loop passes preserve a basic set of analyses
A loop pass that didn't preserve this entire set of passes wouldn't
play well with other loop passes, since these are generally a basic
requirement to do any interesting transformations to a loop.

Adds a helper to get the set of analyses a loop pass should preserve,
and checks that any loop pass we run satisfies the requirement.

llvm-svn: 268444
2016-05-03 21:35:08 +00:00
..
2016-04-18 09:17:29 +00:00