[PATCH] [lld][PECOFF] Implement the reader for the import library.

[Rui Ueyama]

  By default, only the symbol table of an archive file is loaded when a library file is added. The parsing of an individual file in the archive is done when a symbol in the file is actually used. Look for "forceLoadAllArchives" in lib/ReaderWriter/ReaderArchive.cpp.

http://llvm-reviews.chandlerc.com/D987