[PATCH] CodeGen: refactor DwarfException

[Saleem Abdulrasool]

Hi rnk, echristo,

DwarfException served as a base class for exception handling directive emission.
However, this is also used by other exception models (e.g. Win64EH).  Rename
this class to EHStreamer and split it out of DwarfException.h.  NFC.

Use the opportunity to fix up some of the documentation comments to match
current LLVM style.

http://reviews.llvm.org/D4085

Files:
  include/llvm/CodeGen/AsmPrinter.h
  lib/CodeGen/AsmPrinter/ARMException.cpp
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/AsmPrinter/CMakeLists.txt
  lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
  lib/CodeGen/AsmPrinter/DwarfException.cpp
  lib/CodeGen/AsmPrinter/DwarfException.h
  lib/CodeGen/AsmPrinter/EHStreamer.cpp
  lib/CodeGen/AsmPrinter/EHStreamer.h
  lib/CodeGen/AsmPrinter/Win64Exception.cpp
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