David Aurelio c18373f438 Add source map helper
Summary: Adds a helper to produce index source maps for Buck builds

Reviewed By: cpojer

Differential Revision: D4265911

fbshipit-source-id: 9ca3c49876df5db039bae823c0458c98e6e05619
2016-12-05 16:43:45 -08:00
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2016-12-05 16:43:45 -08:00
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