[PATCH] DebugInfo: Introduce the notion of "form classes"

[Alexey Samsonov]

  Use llvm::Optional as suggested by echristo.

Hi dblaikie, echristo,

http://llvm-reviews.chandlerc.com/D1961

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1961?vs=5022&id=5124#toc

Files:
  unittests/DebugInfo/DWARFFormValueTest.cpp
  lib/DebugInfo/DWARFUnit.cpp
  lib/DebugInfo/DWARFContext.cpp
  lib/DebugInfo/DWARFDebugInfoEntry.h
  lib/DebugInfo/DWARFFormValue.cpp
  lib/DebugInfo/DWARFDebugInfoEntry.cpp
  include/llvm/DebugInfo/DWARFFormValue.h
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