[JSC] Hold StructureID instead of Structure* in PolyProtoAccessChain and DFG::CommonData
Created attachment 389453 [details] Patch
Created attachment 389454 [details] Patch
Comment on attachment 389454 [details] Patch r=me
Committed r255542: <https://trac.webkit.org/changeset/255542>
<rdar://problem/59084969>