[PATCH] Add Position-independent Code model Module API.

[Justin Hibbits]

Update the patch to address Rafael's comments.  Add some tests.

http://reviews.llvm.org/D5882

Files:
  include/llvm/IR/Module.h
  include/llvm/Support/CodeGen.h
  lib/IR/Module.cpp
  test/Linker/module-flags-pic-1-a.ll
  test/Linker/module-flags-pic-1-b.ll
  test/Linker/module-flags-pic-2-a.ll
  test/Linker/module-flags-pic-2-b.ll
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