[PATCH] Proper whole-archive handling

[Joerg Sonnenberger]

Hi Bigcheese, rui314, shankarke,

The patch passes the LinkerInput instance down the parseFile/readFile chain to make positional flags possible. It uses this to replace the global forceLoadAllArchive flag with per-input isWholeArchive.

The Darwin option is emulated by setting the flag for all inputs when present. The option -all_load in GNU mode is dropped.

The patch assumes that linker scripts and libraries should inherit the positional flag. At the moment it is not possible to specify flags in linker scripts, so this seems to be an acceptable restriction.

Test case will follow, but I want to get the API change sorted out first.

http://llvm-reviews.chandlerc.com/D1587

Files:
  test/elf/archive-elf-forceload.test
  include/lld/Core/LinkingContext.h
  include/lld/Driver/LinkerInput.h
  include/lld/Driver/DarwinInputGraph.h
  include/lld/ReaderWriter/MachOLinkingContext.h
  include/lld/ReaderWriter/CoreLinkingContext.h
  include/lld/ReaderWriter/PECOFFLinkingContext.h
  include/lld/ReaderWriter/ELFLinkingContext.h
  include/lld/ReaderWriter/ReaderLinkerScript.h
  include/lld/ReaderWriter/Reader.h
  include/lld/ReaderWriter/ReaderArchive.h
  docs/Readers.rst
  unittests/DriverTests/DarwinLdDriverTest.cpp
  lib/Core/LinkingContext.cpp
  lib/Driver/DarwinLdDriver.cpp
  lib/Driver/GnuLdDriver.cpp
  lib/Driver/Driver.cpp
  lib/Driver/LDOptions.td
  lib/ReaderWriter/ELF/Reader.cpp
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  lib/ReaderWriter/ReaderLinkerScript.cpp
  lib/ReaderWriter/Reader.cpp
  lib/ReaderWriter/ReaderArchive.cpp
  lib/ReaderWriter/Native/ReaderNative.cpp
  lib/ReaderWriter/MachO/MachOLinkingContext.cpp
  lib/ReaderWriter/CoreLinkingContext.cpp
  lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
  lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp
  lib/ReaderWriter/PECOFF/ReaderCOFF.cpp
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