One more case for Expr::isConstantInitializer; I think this covers  everything that we aren't intending to implement in Expr::Evaluate.
One more case for Expr::isConstantInitializer; I think this covers 
everything that we aren't intending to implement in Expr::Evaluate.



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@62953 91177308-0d34-0410-b5e6-96231b3b80d8

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