Marc Horowitz bf2500e38e Switch to synchronous strategy for unprotect
Summary:
Older versions of JSC (ios 11 and before) have a bug which I
believe the ProtectionQueue mechanism tickles:
https://bugs.webkit.org/show_bug.cgi?id=186827

This removes the ProtectionQueue and replaces it with an atomic flag
to avoid calling unprotect after VM shutdown.

This also fixes a race condition in shutdown.

Reviewed By: danzimm

Differential Revision: D12969953

fbshipit-source-id: fa3a14f3207be67a987ac3cf0fc1c9ce88837b0b
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