[lworld] Flat access nodes should be pinned

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      Nodes generated from a flat access should be pinned so that pointer-looking-like integers do not float across safepoints. I think flat stores are good because the CastP2XNode is pinned under the current control, preventing the node from floating above a SafePointNode, and safepoints consume all memory, preventing the StoreNode from floating below them. But for flat loads I'm not so sure, while the LoadNode cannot float above safepoints because it has a control input, I don't see why the CastI2N cannot float below a SafePointNode.

            Assignee:
            Quan Anh Mai
            Reporter:
            Quan Anh Mai
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