Ensure Scalar type objects compiles to QAST::WVal
Ensure Scalar type objects compiles to QAST::WVal

It previously would compile into a `getlex`. Amusingly enough, spesh
did try and make the best of a bad situation by sticking in a guard so
things like `nqp::create(Scalar)` and attribute lookups using `Scalar`
would be lowered anyway, which is cute, but still wasteful.

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