[PATCH] D34272: [Tooling] A new framework for executing clang frontend actions.

[Eric Liu via Phabricator via cfe-commits]

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PTAL

I experimented with our internal tools (incl. mapreduce-based execution) and modified the interfaces a bit:
o Get rid of `ExecutionConfig` class; pass actions into executors directly.
o Moved `ArgumentAdjuster`s that are common to all actions into `ExecutionContext`. 
o Make command-line based executor selection more explicit by requiring an `--executor` option.


https://reviews.llvm.org/D34272