cmake build needs to run tests AND collect results
cmake build needs to run tests AND collect results

CMake target "check-lldb" runs the lldb dotest.py suite, but doesn't
collect the results in a usable format. In adding the arguments
necessary to collect these results, I found some minor bugs in CMake
that prevented dotest overrides from being used. This patch fixes them.

<rdar://problem/33389717> cmake build needs to run tests AND collect results


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@308393 91177308-0d34-0410-b5e6-96231b3b80d8

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