[PATCH] D21853: [Driver][OpenMP] Update actions builder to create unbundling 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.

Each time that offloading support is requested by the user and the input file is not a source file, an action `OffloadUnbundlingAction` is created to signal that the input file may contain bundles, so that the proper tool is then invoked to attempt to extract the components of the bundle. This patch adds the logic to create that action in offload action builder.

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

http://reviews.llvm.org/D21853

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

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