[hl] Fix abstract Array with inline dyn length segfault

[yuxiaomao]

See test for repro.

hl-check gives Check failure at fun@3750 @D - Register 1(hl.types.ArrayObj) should be hl.types.ArrayDyn and not hl.types.ArrayObj on compilation, and the program access violation on runtime when accessing .length.

This ArrayObj tries to access ArrayDyn seems to come from inline and abstract(Array), where haxe compiler generate the following dump

[Field:Int]
	[Local shape(0):IPolygon:IPolygon]
	[FInstance:Int]
		Array<Any>
		length:Int