[hack] Put latest_heap_size in shared heap to fix a bug introduced in D7282948 ("Run shared memory collector in a worker process")
[hack] Put latest_heap_size in shared heap to fix a bug introduced in D7282948 ("Run shared memory collector in a worker process")

Summary:
This variable was not shared memory, so workers seen it as 0 and ended up
always running the collection.

Reviewed By: jamesjwu

Differential Revision: D7340028

fbshipit-source-id: 0030a804bae618933ced6ff3352bc2ae5a09d182

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