[Webkit-unassigned] [Bug 205625] New: [JSC] Remove WTF::loadLoadFence from JSFunction::rareData()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205625

            Bug ID: 205625
           Summary: [JSC] Remove WTF::loadLoadFence from
                    JSFunction::rareData()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ysuzuki at apple.com

Since it is not necessary. We are putting storeStoreFence() when putting RareData into this field.
And, we never support concurrent access to this field if CPU does not support appropriate memory-ordering restriction (we strongly assume that acquire-fence for data dependent load is not necessary if store-store fence is appropriately emitted, if this guarantee is not met, we can just disable concurrency for this CPU (DEC Alpha)).

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