ArchiveFileDescriptorTests: Resurrect part of r197600, but make it invalidated, to appease buildbots.

Please revert this several hours later ;)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197635 91177308-0d34-0410-b5e6-96231b3b80d8
ArchiveFileDescriptorTests: Fix CMake build. Each unit test is expected to have suffix "*Tests" for lit gtest runner to seek one.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197636 91177308-0d34-0410-b5e6-96231b3b80d8