Add existing unit tests to Xcode project
Add existing unit tests to Xcode project

Summary:
This adds gtest test files to the Xcode project which were
previously only in the cmake config. This is the first of several
planned merges.

Reviewers: beanz, spyffe, jingham

Reviewed By: jingham

Subscribers: lldb-commits

Differential Revision: https://reviews.llvm.org/D36485

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@310417 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb