LibJS: More spreading support for the Bytecode-VM

[Hendiadyoin1]

Also hopefully includes a fix for #12127

[Hendiadyoin1]

Ok, ci says, i screwed up sizes somewhere or something, Will investigate later

[davidot]

Ok, ci says, i screwed up sizes somewhere or something, Will investigate later

Looks like the #12127 problem, quite an annoying one, you can probably just move around the js source in bytecode to fix it

[Hendiadyoin1]

Ups i left a few debug prints in here...

[Hendiadyoin1]

@linusg is the added note sufficient?

[linusg]

Gonna leave this one up to @alimpfard - if you want to block on simplifying the opcodes as mentioned in the discussions above, feel free.

[alimpfard]

Let's have the feature, we can simplify later, no need to block.

[Hendiadyoin1]

@alimpfard That made codegen a but easier Is this version to your linking?