Hide IRShow include from Revise (#56756)
Revise in theory wants to re-evaluate this include, but it fails at
doing so, because the include call no longer works after bootstrap. It
happens to work right now on master, because the lowering of
`Compiler.include` happens to hide the include call from Revise, but
that's a Revise bug I'm about to fix. Address this by moving the include
call into the package and using an absolute include if necessary.
