Chinmay Garde 58e84c8bf0
Re-land "Support multiple shells in a single process. (#4932)" (#4998)
* Re-land "Support multiple shells in a single process. (#4932)"

This reverts commit 723c7d01439da4261bc836075fb55651ce9e7f03.
2018-04-13 13:48:15 -07:00
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