Set visibility of ivar offset symbols according to  accessibility of the ivar (related to objc2's non-fragile abi).
Set visibility of ivar offset symbols according to 
accessibility of the ivar (related to objc2's
non-fragile abi).


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@63166 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang