[PATCH] D18172: [CUDA][OpenMP] Add a generic offload action builder

[Samuel Antao via cfe-commits]

sfantao created this revision.
sfantao added reviewers: ABataev, jlebar, tra, echristo, hfinkel.
sfantao added subscribers: caomhin, carlo.bertolli, arpith-jacob, cfe-commits.

This patch proposes a new class to generate and record action dependences related with offloading. The builder provides three main functionalities:
- Add device dependences to host actions.
- Add host dependence to device actions.
- Register device top-level actions.

The constructor of the builder detect the programming models that should be supported, and generates a specialized builder for each. If a new programming model is to be added in the future, only a new specialized builder has to be implemented. 

When the specialized builder is generated, it produces programming-model-specific diagnostics.

A CUDA specialized builder is proposed in the patch that mostly consists of the partition of the current  `buildCudaAction` by the three different functionalities.  

http://reviews.llvm.org/D18172

Files:
  lib/Driver/Driver.cpp

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