[PATCH] D24706: [ELF] - Partial support of --gdb-index command line option (Part 1).

[George Rimar via llvm-commits]

grimar created this revision.
grimar added reviewers: ruiu, rafael.
grimar added subscribers: llvm-commits, grimar, emaste, evgeny777.
Herald added subscribers: mgorny, beanz.

This patch is extracted from D24267 which implements the --gdb-index option.
(aim is to reduce and split review parts)

In this patch partial gdb_index section is created. 
For costructing the .gdb_index section 6 steps should be performed (details are in
SplitDebugInfo.cpp file header), this patch do first 3:

1) Creates proper section header.
2) Fills list of compilation units.
3) Types CU list area is not supposed to be supported, so it is ignored and therefore
can be treated as implemented either.

https://reviews.llvm.org/D24706

Files:
  ELF/CMakeLists.txt
  ELF/Config.h
  ELF/Driver.cpp
  ELF/InputFiles.cpp
  ELF/InputFiles.h
  ELF/Options.td
  ELF/OutputSections.cpp
  ELF/OutputSections.h
  ELF/SplitDebugInfo.cpp
  ELF/SplitDebugInfo.h
  ELF/Writer.cpp
  test/ELF/Inputs/gdb-index-a.elf
  test/ELF/Inputs/gdb-index-b.elf
  test/ELF/gdb-index.s

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