Adjust PC after hitting breakpoint on remote target.

This commit adds an example python file that can be used with 'target-definition-file' setting for Linux gdbserver.
This file has an extra key 'breakpoint-pc-offset' that LLDB uses to determine how much to change the PC
after hitting the breakpoint.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@192962 91177308-0d34-0410-b5e6-96231b3b80d8