migrate uses of lsan workarounds to the lsan wrapper folly::lsan_ignore_object
migrate uses of lsan workarounds to the lsan wrapper folly::lsan_ignore_object

Summary: The workaround maintains a set of leaked pointers so that lsan can see them as being reachable and not interpret them as being leaked. But lsan also offers its own interface for this.

Reviewed By: Gownta

Differential Revision: D40917854

fbshipit-source-id: 0afd6f4995c5dc4f27020db3e4794353515a9e43

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