[Webkit-unassigned] [Bug 165769] New: Eliminate filling extra stack slots with undefined JSValues for register arguments

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165769

            Bug ID: 165769
           Summary: Eliminate filling extra stack slots with undefined
                    JSValues for register arguments
    Classification: Unclassified
           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: msaboff at apple.com

In DFGSpeculativeJIT64.cpp emitCall(), we need to put jsUndefined values in both argument registers and stack slots for extra argument.

This is needed because the LLInt entry points are generic and don't know home many parameters to expect for a particular call.  Therefore these thunks don't know that they should spill extra register arguments to the stack.

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