[PATCH] D21857: [Driver][OpenMP] Add support to create jobs for unbundling actions.

[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.

This patch adds the support to create jobs for the `OffloadBundlingAction` which will invoke the `clang-offload-bundler` tool to unbundle input files.

Unlike other actions, unbundling actions have multiple outputs. Therefore, this patch adds the required changes to have a variant of `Tool::ConstructJob` with multiple outputs. 

The way the naming of the results is implemented is also slightly modified so that the same action can use a different offloading prefix for each use by the different offloading actions. 

http://reviews.llvm.org/D21857

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

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