Some random comment, naming, and format changes.

Rename the AttributeImpl* from Attrs to pImpl to be consistent with other code.
Add comments where none were before. Or doxygen-ify other comments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170767 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed