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

[Keith Walker]

  Updated the patch for generating DWARF debug stack frame information when compiling with -g for ARM or Thumb with changes due to comments recieved; mainly coding style violations, and minor code improvements.

Hi rengolin, echristo, asl, rnk,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2706?vs=6894&id=7130#toc

Files:
  lib/CodeGen/AsmPrinter/ARMException.cpp
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/AsmPrinter/DwarfException.h
  lib/Target/ARM/ARMFrameLowering.cpp
  lib/Target/ARM/Thumb1FrameLowering.cpp
  test/CodeGen/ARM/debug-frame-large-stack.ll
  test/CodeGen/ARM/debug-frame-no-debug.ll
  test/CodeGen/ARM/debug-frame-vararg.ll
  test/CodeGen/ARM/debug-frame.ll
  test/CodeGen/ARM/debug-info-sreg2.ll
  test/CodeGen/ARM/indirectbr-2.ll
  test/CodeGen/ARM/indirectbr.ll
  test/CodeGen/ARM/interrupt-attr.ll
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