Make constexpr compilation robust against multiple compilation

Instead of setting the old AST type to zero, replace the AST with
the compiled constexpr AST zval. This requires passing in

Make constexpr compilation robust against multiple compilation

Instead of setting the old AST type to zero, replace the AST with
the compiled constexpr AST zval. This requires passing in a
zend_ast** instead of a zend_ast*.

This allows compiling ASTs containing constexprs multiple times
-- the second time, the existing compiled representation will be
resused.

This means we no longer need to copy the attributes AST for
promoted properties.

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Change Attribute Syntax from @@ to #[]

Fixed bug #79897: Promoted constructor params with attribs cause crash

This was caused by the attribute AST being used twice, and was fixed by
creating a temporary copy of it (and destro

Fixed bug #79897: Promoted constructor params with attribs cause crash

This was caused by the attribute AST being used twice, and was fixed by
creating a temporary copy of it (and destroying said copy) when neccesary.

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