Comment out the heap building in repl translation

It fails on my machine with

> ld: in section __TEXT,__text reloc 8429090: too may fixups in
> Overload.merge_oinfos(3)merge(3) for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
*** Failed to execute
  cc -o local-hol-heap local-hol-heap.o -L/Users/sao/polyml.5.5/lib
-lpolymain -lpolyml -Wl,-no_pie
successfully