[Webkit-unassigned] [Bug 148338] DFG string concatenation shouldn't be playing fast and loose with effects and OSR exit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148338

--- Comment #1 from Filip Pizlo <fpizlo at apple.com> ---
Proposal:

- ByteCodeParser uses a new node called StrCat that takes two or three arguments, and is basically a MakeRope with ToString rolled together.

- FixupPhase simplifies ValueAdd to MakeRope only if we can speculate that the inputs are strings.

- FixupPhase simplifies StrCat the same way it does for ValueAdd.

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