Debug Info: add an identifier field to DICompositeType.

Paired with llvm r189282.
Update testing cases to handle an extra field for DICompositeType.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189283 91177308-0d34-0410-b5e6-96231b3b80d8
13 files changed