Since the diagnostics engine understands Attr objects, this code is no longer required -- we can just pass in the attribute directly.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@199664 91177308-0d34-0410-b5e6-96231b3b80d8
Remove virtual methods that were added in 2009 and still had 1 implementation.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@199665 91177308-0d34-0410-b5e6-96231b3b80d8
Fixing a typo (turned out to be harmless since the default priority values are the same between the two attributes).

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@199666 91177308-0d34-0410-b5e6-96231b3b80d8