Linker errors when running JS TH splices with undeclared deps

Summary

On !12479 (merged), I noticed a bug in the running of JS TH splices. The following example runs fine with a non-JS compiler but fails with a linker error when using the JS backend.

The issue seems to be that it is unaware of a dependency on a package bundled with GHC. Normally I think GHC would just load this package, but it seems that the JS linker errors out instead.

Steps to reproduce

{-# LANGUAGE TemplateHaskell #-}
module Repro where

import GHC.Exts.Heap
import Control.Monad.IO.Class

-- this is a TH splice
do
  let b = asBox "foo"
  liftIO $ print b
  return []

Then with the boot compiler:

ghc Roro.hs 
[1 of 1] Compiling Roro             ( Roro.hs, Roro.o )
0x420035f9d0

With the GHC JS backend:

❯ _build/stage1/bin/javascript-unknown-ghcjs-ghc Roro.hs 
[1 of 1] Compiling Roro             ( Roro.hs, Roro.o ) [Source file changed]
<no location info>: error:
    panic! (the 'impossible' happened)
  GHC version 9.11.20240524:
        getDeps: Couldn't find home-module: 
  GHC.Exts.Heap.Closures
  Call stack:
      CallStack (from HasCallStack):
        callStackDoc, called at compiler/GHC/Utils/Panic.hs:190:37 in ghc:GHC.Utils.Panic
        pprPanic, called at compiler/GHC/StgToJS/Linker/Linker.hs:496:28 in ghc:GHC.StgToJS.Linker.Linker
  CallStack (from HasCallStack):
    panic, called at compiler/GHC/Utils/Error.hs:507:29 in ghc:GHC.Utils.Error


Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug

The error goes away if I explicitly add a -package ghc-heap argument to the call.

Expected behavior

They should behave the same either both giving a helpful error, or both succeeding

Environment

• GHC version used: The Glorious Glasgow Haskell Compilation System, version 9.11.20240524