added test fixture to EditlineTest gtest
added test fixture to EditlineTest gtest

Primarily a trial test for me to try out the
git clang-format integration.  Works like a charm!

This change adds a gtest fixture for the EditlineTest
common setup and teardown code.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@258565 91177308-0d34-0410-b5e6-96231b3b80d8

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