Last part of PR3254: use the same alignment computation in Sema and  CodeGen.  I'm not sure whether this actually makes any visible  difference, but it's better to be consistent anyway.
Last part of PR3254: use the same alignment computation in Sema and 
CodeGen.  I'm not sure whether this actually makes any visible 
difference, but it's better to be consistent anyway.



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@65259 91177308-0d34-0410-b5e6-96231b3b80d8

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