[PATCH] [ELF] Support --defsym option to define an absolute symbol.

[Rui Ueyama]

Hi Bigcheese,

This patch is to support --defsym option for ELF file format/GNU-compatible
driver. Currently it takes a symbol name followed by '=' and a number. If such
option is given, the driver sets up an absolute symbol with the specified
address. You can specify multiple --defsym options to define multiple symbols.

GNU LD's --defsym provides many more features. For example, it allows users to
specify another symbol name instead of a number to define a symbol alias, or it
even allows a symbol plus an offset (e.g. --defsym=foo+3) to define symbol-
relative alias. This patch does not support that, but will be supported in
subsequent patches.

http://llvm-reviews.chandlerc.com/D3208

Files:
  include/lld/Core/LinkingContext.h
  include/lld/ReaderWriter/ELFLinkingContext.h
  include/lld/ReaderWriter/PECOFFLinkingContext.h
  lib/Core/LinkingContext.cpp
  lib/Driver/GnuLdDriver.cpp
  lib/Driver/GnuLdOptions.td
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  lib/ReaderWriter/PECOFF/PECOFFLinkingContext.cpp
  test/elf/defsym.objtxt
  test/pecoff/include.test
  unittests/DriverTests/GnuLdDriverTest.cpp
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