[PATCH] Support for generating DWARF .debug_aranges sections.

[Richard Mitton]

  I was actually planning to do that, but it turns out the raw arange data
  on it's own doesn't actually give much useful information to test
  against (it's just two numbers with no context).  I found it basically
  impossible to write a useful test against the dwarfdump output.

  Richard Mitton
  richard at codersnotes.com

http://llvm-reviews.chandlerc.com/D1649