gdb: Drop debug output

gdb/ghc_gdb/find_refs.py

@@ -65,7 +65,6 @@ def find_refs(closure_ptr: Ptr, include_static=True) -> Iterator[Ptr]:
     inf = gdb.selected_inferior()
     closure_ptr = closure_ptr.untagged()
     heap_start, heap_end = heap_bounds()
-    print('Heap bounds: %r - %r' % (heap_start, heap_end))
     for tag in range(0,7):
         val = closure_ptr.tagged(tag).pack() # type: bytes