[PATCH] [lld][LinkerScript] Add matching of output sections to segments

[Denis Protivensky]

Hi Bigcheese,

Add method to query segments for specified output section name. Return error if the section is assigned to unknown segment.
Check matching of sections to segments during layout on the subject of correctness.
NOTE: no actual functionality of using custom segments is implemented.

http://reviews.llvm.org/D10359

Files:
  include/lld/Core/Error.h
  include/lld/ReaderWriter/LinkerScript.h
  lib/Core/Error.cpp
  lib/ReaderWriter/ELF/TargetLayout.cpp
  lib/ReaderWriter/ELF/TargetLayout.h
  lib/ReaderWriter/LinkerScript.cpp
  test/elf/linkerscript/phdrs-default.test
  test/elf/linkerscript/phdrs-invalid.test
  test/elf/linkerscript/phdrs/sections-empty-phdrs.script
  test/elf/linkerscript/phdrs/sections-no-phdrs.script
  test/elf/linkerscript/phdrs/sections-none-phdrs.script
  test/elf/linkerscript/phdrs/undef-empty-phdrs.script
  test/elf/linkerscript/phdrs/undef-id-phdrs.script
  test/elf/linkerscript/phdrs/undef-no-phdrs.script

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