compiler doesn't understand linkage of dart.dynamic, void, bottom

[jmesserly]

After CL 6c1c940 it is no longer safe for the compiler to assume dart.dynamic is a valid JS expression to instantiate it.

Instead the compiler needs to understand that dynamic is a first class reference to the Type for dynamic, and know what Element corresponds to that type declaration, so it can be generated in the correct order.

[jmesserly]

in general all "dart." references are problematic now. We need to instead go through _emitTypeName. The good news is we can probably eliminate special case code we have for these types.

[jmesserly]

Oh shoot. So it's easy to fix, but I blundered into #257. Taking a look at that now.

[jmesserly]

This is fixed now