Also pass the source into the compile method.
This way compiler can be reused for subsequent compile.
Does remove some double boots, but no major time save
next's position was only updated initially
previous logic relied on pushing everything long rightly
but it wasn't right, and no harm in setting position twice,
as events only fire if there is real change
cpu_init still translates from risc_init
but since interpreter is a platform risc_init is a private thing
and the cpu_init does not need to be lazily created, so it's done in the init
used to traverse all methods in space
now "just" use the passed assemblers, which usually should be compiled and builtin (but for testing . . .)
tests fixed accordingly
