swift234

SILGen: Implement getting properties.
- Steal some bits from SILConstant::id to reference getter and setter definitions, and normalize SILConstant references to property FuncDecls to be SILConstant references to the ValueDecl getter/setter instead.
- In normal expression context, handle getting properties by calling the getter and materializing the return value. Setting lvalues is not implemented yet; that will require borrowing the LValue and GenLValue machinery from irgen to construct logical lvalue paths in assignment and byref contexts.

Swift SVN r3414