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Perform constant folding.
- If variable has a const initializer, return that initializer.Returns:initializer if there is one, null if not, ErrorExp if error
- Constant fold an Expression.Parameters:
expression to const fold; this may get modified in-place int
WANTvalue, WANTexpand, or both bool
eis an lvalue, and keep it as an lvalue since it is an argument to a ref or out parameter, or the operand of & operatorReturns:Constant folded version of