[PATCH] llvm-objdump: Dump COFF import table if -private-headers option is given.

[Rui Ueyama]

This is a patch to add capability to llvm-objdump to dump COFF Import Table
entries, so that we can write tests for LLD checking Import Table contents.

llvm-objdump did not print anything but just file name if the format is COFF
and -private-headers option is given. This is a patch adds capability for
dumping DLL Import Table, which is specific to the COFF format.

In this patch I defined a new iterator to iterate over import table entries.
Also added a few functions to COFFObjectFile.cpp to access fields of the entry.

http://llvm-reviews.chandlerc.com/D1719

Files:
  include/llvm/Object/COFF.h
  lib/Object/COFFObjectFile.cpp
  test/tools/llvm-objdump/Inputs/nop.exe.coff-i386
  test/tools/llvm-objdump/Inputs/trivial.obj.elf-i386
  test/tools/llvm-objdump/Inputs/win64-unwind.exe.coff-x86_64
  test/tools/llvm-objdump/Inputs/win64-unwind.exe.coff-x86_64.asm
  test/tools/llvm-objdump/coff-private-headers.test
  test/tools/llvm-objdump/disassembly-show-raw.s
  test/tools/llvm-objdump/disassembly-show-raw.test
  test/tools/llvm-objdump/lit.local.cfg
  test/tools/llvm-objdump/win64-unwind-data.s
  test/tools/llvm-objdump/win64-unwind-data.test
  tools/llvm-objdump/COFFDump.cpp
  tools/llvm-objdump/llvm-objdump.cpp
  tools/llvm-objdump/llvm-objdump.h
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