Fix missing semicolons

[AnsonYeung]

Add semicolons in several places in the codegen

This fixes JS codegen on the IR Label(lbl, Break(lbl, true), End())

[LPTK]

Thanks! But there is no need to add semicolons after things like function definitions and classes. class Foo {} console.log("ok") is valid JS.

BTW, the CI fails due to flakiness for a reason @chengluyu has already fixed in a separate PR.