[Webkit-unassigned] [Bug 194944] New: [JSC] We should consider move UnlinkedFunctionExecutable::m_parentScopeTDZVariables to RareData

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194944

            Bug ID: 194944
           Summary: [JSC] We should consider move
                    UnlinkedFunctionExecutable::m_parentScopeTDZVariables
                    to 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: ticaiolima at gmail.com

Based on profiling data on Speedometer2, JetStream2, Kranken, Octane and LongSpider, `UnlinkedFunctionExecutable::m_parentScopeTDZVariables` often is carrying an empty VariableEnvironment (see results below).
In such case, we should consider move it to RareData and ensure it only when `parentScopeTDZVariables` is not empty.

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