Revert "Another little stepping optimization: if any of the source step commands are running through a range "
Revert "Another little stepping optimization: if any of the source step commands are running through a range "

- Revert because this commit introduce several failures in lldb test suite
- http://lab.llvm.org:8011/builders/lldb-x86_64-ubuntu-14.04-cmake/builds/8391
- This reverts commit 78943bb678c2893703ee4e8b41969372740c8a6f.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@252980 91177308-0d34-0410-b5e6-96231b3b80d8

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