[PATCH] D15960: Don't build jobs for the same Action + ToolChain twice.

[Justin Lebar via cfe-commits]

jlebar created this revision.
jlebar added a reviewer: echristo.
jlebar added a subscriber: cfe-commits.

Right now if the Action graph is a DAG and we encounter an action twice,
we will run it twice.

This patch is difficult to test as-is, but I have testcases for this as
used within CUDA compilation.

http://reviews.llvm.org/D15960

Files:
  include/clang/Driver/Driver.h
  lib/Driver/Driver.cpp

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