More misc. rodinia opts

• Make GCM not spill ParallelReduce phis.
• Fix unification for inter-device communication.
• Make notion of parallel indices sets more flexible, and use in infer parallel reduce.
• Misc. schedule tweaks.

requested review from @aaronjc4

assigned to @rarbore2

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• 1b78bc2e - Refactor infer parallelreduce

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changed the description

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• eaf09eb1 - hmm

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merged

mentioned in commit 5f42f3d7

mentioned in issue #29 (closed)