Backport 5786 to v4.x (memory growth with 'vm' module)#6871

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rvagg merged 5 commits intonodejs:v4.x-stagingfrom

rvagg:5392-backport

May 20, 2016

Commits on May 20, 2016

contextify: cleanup weak ref for global proxy

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contextify: cleanup weak ref for sandbox

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contextify: replace deprecated SetWeak usage

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contextify: cache sandbox and context in locals

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contextify: tie lifetimes of context & sandbox

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