Refactor global decls to hold either a regular Decl or a CXXConstructorDecl + ctor type or a CXXDestructorDecl + dtor type.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70962 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed