[PECOFF] Support linking against DLL.

This patch adds a new pass, IdataPass, to transform shared atom references
to real references and to construct the .idata section data. With this patch
lld can produce a working Hello World program by linking it against
kernel32.dll and user32.dll.

Reviewers: Bigcheese

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D1096

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@186071 91177308-0d34-0410-b5e6-96231b3b80d8