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

[Justin Hibbits]

Hi echristo,

This makes PIC levels a Module flag attribute, which can be queried by the
backend.  The flag is named `flag_pic`, and can have a value of:

  0 - Backend-default
  1 - Small-model (-fPIC)
  2 - Large-model (-fPIC)

These match the `-pic-level' command line argument for clang, and the value of the
preprocessor macro `__PIC__'.

http://reviews.llvm.org/D5882

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/IR/Module.h
  include/llvm/Support/CodeGen.h
  lib/IR/Module.cpp
  tools/llc/llc.cpp
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