[0.85] Fix long GC pauses in hermes v1

[mjmasn]

Target Branch

0.85

Link to commit or PR to be picked

facebook/hermes@340e562

Description

Clone of #1427 for 0.85 branch as I'm pretty sure we're hitting this or something very similar in production on 0.85.1

Title: Hades GC heap fragmentation in old generation causes long pauses during young-gen promotion

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