[Webkit-unassigned] [Bug 179821] New: Update DFGSafeToExecute to be aware that ArrayPush is now a varargs node

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179821

            Bug ID: 179821
           Summary: Update DFGSafeToExecute to be aware that ArrayPush is
                    now a varargs node
           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: rmorisset at apple.com

https://bugs.webkit.org/show_bug.cgi?id=175823 made the ArrayPush node a varargs kind of node.
This occasionally causes an assertion failure when running with verboseCFA=1 because of a call to node->child1() in DFGSafeToExecute.h for ArrayPush.
I propose a simple fix, using "graph.varArgsChild(node, 1)" instead.

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