[PATCH] [lld][core] support .gnu.linkonce sections

[Shankar Kalpathi Easwaran]

Hi Bigcheese, kledzik, atanasyan,

This adds support for resolving .gnu.linkonce sections.

.gnu.linkonce sections are similar to section groups. They were supported before section groups existed and provided a way to resolve COMDAT sections using a different design. There are few implementations that use .gnu.linkonce sections to store simple floating point constants which doesnot require complex section group support but need a way to store only one copy of the floating point constant. .gnu.linkonce based symbol resolution achieves that.




http://llvm-reviews.chandlerc.com/D3242

Files:
  include/lld/Core/DefinedAtom.h
  include/lld/Core/Resolver.h
  lib/Core/DefinedAtom.cpp
  lib/Core/Resolver.cpp
  lib/ReaderWriter/Native/WriterNative.cpp
  lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
  test/core/gnulinkonce-rearrange-resolve.objtxt
  test/core/gnulinkonce-remaining-undef.objtxt
  test/core/gnulinkonce-resolve.objtxt
  test/core/gnulinkonce-simple.objtxt
  test/core/sectiongroup-gnulinkonce-error.objtxt
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