Don't repeat name in comment or duplicate comment. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222724 91177308-0d34-0410-b5e6-96231b3b80d8
Link the type of aliases.

They are not more or less "well typed" than GlobalVariables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222725 91177308-0d34-0410-b5e6-96231b3b80d8