[Webkit-unassigned] [Bug 135545] New: [ftlopt] The parser should emit AST nodes the var declarations with no initializers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135545

           Summary: [ftlopt] The parser should emit AST nodes the var
                    declarations with no initializers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: sbarati at apple.com


Currently, when the parser is parsing a variable declaration list and sees a var declarator without an initializer, it just adds the variable name to the environment in the parsing context, but does not actually create an AST node when there is no initializer. 
Because it doesn't create an AST node, the helper function that calls this parsing method may emit an EmptyExpression AST node, or may emit a CommaNode where there aren't nodes in the CommaNode representing empty initializers.
We should emit an AST node here that represents declaring variables without initializers because it gives high fidelity type profiling the opportunity to emit code that observes this variable.

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