Query only the latest version of an identifier in the PCH chain. Make sure this version holds the entire declaration chain. This is a much saner solution than trying to merge the info from all elements, and makes redeclarations work properly. Expand the declarations test case to cover more compliated cases.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110052 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed