[Webkit-unassigned] [Bug 140233] New: Add the lexicalEnvironment as an operand to op_get_argument_by_val

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140233

            Bug ID: 140233
           Summary: Add the lexicalEnvironment as an operand to
                    op_get_argument_by_val
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

This is another step towards having the DFG CreateArguments and GetMyArgumentByVal nodes take the lexicalEnvironment as a parameter.

Also changed the default value of CodeBlock::lexicalEnvironment() to a constant 0 VirtualRegister instead of an invalid one.  This makes the BytecodeGenerator code that loads it as an operand slightly more readable.

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