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51a4511b72721080b7afe59cf9dd0bf3b9252fad
where it is retrieving the Return Address register contents on a target where that's a thing. If we fail to get a valid RA, we force a switch to the fallback unwind plan. This patch adds a sanity check for that fallback unwind plan -- it must get a valid CFA for this frame in addition to being able to retrieve the caller's PC -- and it correctly marks the unwind rules as failing if the fallback unwind plan fails. <rdar://problem/19010211> llvm-svn: 222301
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