[PATCH] D21852: [Driver][OpenMP] Update actions builder to create bundling action when necessary.

[Samuel Antao via cfe-commits]

sfantao created this revision.
sfantao added reviewers: echristo, tra, jlebar, hfinkel, ABataev.
sfantao added subscribers: caomhin, carlo.bertolli, arpith-jacob, andreybokhanko, Hahnfeld, cfe-commits.
Herald added a subscriber: mehdi_amini.

In order to save the user from dealing with multiple output files (for host and device) while using separate compilation, a new action `OffloadBundlingAction` is used when the last phase is not linking. This action will then result in a job that uses the proposed bundling tool to create a single preprocessed/IR/ASM/Object file from multiple ones.

The job creation for the new action will be proposed in a separate patch.

http://reviews.llvm.org/D21852

Files:
  include/clang/Driver/Action.h
  lib/Driver/Action.cpp
  lib/Driver/Driver.cpp
  lib/Driver/ToolChain.cpp
  test/Driver/openmp-offload.c

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