Merge changes Idd0fb06a,Ia17dd540,I96c6592a,I0eacb3f0,I8e2895ec, ... into nyc-dev

* changes:
  Do not add linker the _r_debug.r_map on link_image
  Improvements to dynamic linker messages
  Move gdb support functions to a separate file
  Use insert_link_map_into_debug_map for executable
  Update a comment for init_linker_info_for_gdb
  Initialize linker link_map for gdb directly