Shankar Easwaran 67e98f5197 [InputGraph] Add capability to process Hidden nodes.
Hidden nodes could be a result of expansion, where a flavor might decide to keep
the node that we want to expand but discard it from being processed by the
resolver.

Verifies with unittests.

llvm-svn: 195516
2013-11-22 23:19:53 +00:00
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