[PATCH] Generate DWARF stack frame information for ARM/Thumb functions [2nd attempt].

[Renato Golin]

  Folks,

  I've submitted D2722, which should be orthogonal to this patch, but my next move will be to use Keith's Asm->needsCFIMoves(); to decide what to emit (Dwarf or EH or nothing), and that needs this patch.

  The patch looks good to me, and has a huge number of tests, which will help me a lot adding new functionality to it, but I have to say, I'd like more people looking at this patch before accepting.

  Thanks!
  --renato

http://llvm-reviews.chandlerc.com/D2706