Use AttributeSet instead of Attribute to verify things.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173101 91177308-0d34-0410-b5e6-96231b3b80d8
Fix spelling

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173103 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173106 91177308-0d34-0410-b5e6-96231b3b80d8