[PATCH] Preliminary driver changes to build and stitch together host and device-side CUDA compilation pipelines.

[Artem Belevich]

Hi eliben, echristo,

These are preliminary driver changes to build and combine host and device-side CUDA code.
Current patch relies on external ptxwrap tool (http://reviews.llvm.org/D8397) to generate glue 
code for incorporation of device-side PTX into host-side object file. This part will be replaced.

Basic flow for CUDA compilation:
  - create new InputAction(TY_CUDA_DEVICE, input.cu) for each unique --gpu-architecture <GPU> flag
  - run BuildActions() on them
  - for each action chain, create CudaDeviceAction to associate it with the <GPU> parameter.

  During BuildJobsForActions CudaDeviceAction is handles similarly to BindArchAction -- it picks device-specific 
  toolchain and then proceeds with BuildJobsForActions() for the rest of the action chain.
  CudaHostAction adds flags to include device-side outputs and proceeds with BuildJobsForActions() normally otherwise.

Added a test to verify driver pipeline construction.

Depends on: http://reviews.llvm.org/D8397 (ptxwrap tool).

http://reviews.llvm.org/D8463

Files:
  include/clang/Driver/Action.h
  include/clang/Driver/Driver.h
  include/clang/Driver/Options.td
  include/clang/Driver/Types.def
  include/clang/Driver/Types.h
  lib/Driver/Action.cpp
  lib/Driver/Driver.cpp
  lib/Driver/ToolChain.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  lib/Driver/Types.cpp
  test/Driver/cuda-options.cu
  test/Index/attributes-cuda.cu
  tools/libclang/CIndex.cpp
  unittests/ASTMatchers/ASTMatchersTest.h

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