Matt Pharr 25665f0841 Implement NullPointerExpr::GetConstant() ...

Also reworked TypeCastExpr::GetConstant() to just forward the request along
and moved the code that was previously there to handle uniform->varying
smears of function pointers to FunctionSymbolExpr::GetConstant().

Fixes issue #168.

2012-01-31 09:37:39 -08:00

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