[Webkit-unassigned] [Bug 206430] New: Deleting a property should not turn structures into uncacheable dictionaries

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206430

            Bug ID: 206430
           Summary: Deleting a property should not turn structures into
                    uncacheable dictionaries
           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: justin_michaud at apple.com

Right now, deleteProperty/removePropertyTransition causes a structure transition to uncacheable dictionary. Instead, we should allow it to transition to a new regular structure like adding a property does. This means that we have to:

1) Break the assumption that structure transition offsets increase monotonically
2) Add a new transition map and transition kind for deletes
3) Find some heuristic for when we should actually transition to uncacheable dictionary.

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