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

[Alexey Samsonov]

Hi dblaikie,

Use DWARF4 table of form classes to fetch attributes from DIE
in a more consistent way. This shouldn't change the functionality and
serves as a refactoring for upcoming change: DW_AT_high_pc has different
semantics depending on its form class.

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

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