add an a Attr::Destroy method and force clients to go through it.  As part of 
this, make DeclBase::Destroy destroy attributes instead of the DeclBase dtor.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66020 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed