[Webkit-unassigned] [Bug 143736] DFG should not insert Phantoms in bytecode parsing or as part of transformations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143736

--- Comment #2 from Filip Pizlo <fpizlo at apple.com> ---
I think that we need to just embrace the fact that the DFG IR prior to FixupPhase *does* currently accurately represent all bytecode uses.  This may be hard to maintain, but it *is* useful.

The part that we believe to be unsound is maintaining that same information in DFG IR *after* we have completed FixupPhase and are doing other transformations.

If we embrace this, then we would be able to also bring back DCE. This time it would be a pre-FixupPhase DCE.

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