[PATCH] Added -mlink-init-bitcode-file option to pre-populate new module with IR loaded from specified file.

[Artem Belevich]

Hi echristo, dblaikie, rnk,

- Added -mlink-init-bitcode-file option to pre-populate new module with IR loaded from specified file.
- Accept IR assembly as well as bitcode.
- Added test case.

The change is needed for upcoming CUDA-related changes that require linking with large device-specific library provided as bitcode. Initializing module with the library IR is faster than linking the library in after compilation. It also allows convenient way to run some cuda-specific passes on the library IR (NVVM reflect and Internalize) alone without affecting IR we generate during compilation.

http://reviews.llvm.org/D9721

Files:
  include/clang/CodeGen/ModuleBuilder.h
  include/clang/Driver/CC1Options.td
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/CodeGenAction.cpp
  lib/CodeGen/ModuleBuilder.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/link-bitcode-file.c

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