Modify the EFI KDP debugging to not use any dynamic loader since it does manual dynamic loading itself via python modules.

Also track down the required binary by trying to locate the main executable module through LLDB's symbol and executable file locating code.

<rdar://problem/16570258>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@213199 91177308-0d34-0410-b5e6-96231b3b80d8