[PATCH] DWARF64 Fixes

[Tong Shen]

Hi tfiala, jasonmolenda,

1. DW_FORM_strp and DW_FORM_sec_offset are 64bits for DWARF64 / 32bits for DWARF32
They are different from DW_FORM_addr, whose size is specified in .debug_info

2. Bump DWARF version support form [2,3] to [2,4] in DWARFDebugLine.cpp

3. Fix DWARFDebugLine to support DWARF64

http://reviews.llvm.org/D5307

Files:
  source/Plugins/SymbolFile/DWARF/DWARFAbbreviationDeclaration.cpp
  source/Plugins/SymbolFile/DWARF/DWARFCompileUnit.cpp
  source/Plugins/SymbolFile/DWARF/DWARFCompileUnit.h
  source/Plugins/SymbolFile/DWARF/DWARFDataExtractor.h
  source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp
  source/Plugins/SymbolFile/DWARF/DWARFDebugLine.cpp
  source/Plugins/SymbolFile/DWARF/DWARFDebugPubnames.cpp
  source/Plugins/SymbolFile/DWARF/DWARFFormValue.cpp
  source/Plugins/SymbolFile/DWARF/DWARFFormValue.h
  source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
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