VM: init_code_heap is trivial and only used once, so let's remove it

vm/code_heap.cpp

@@ -94,9 +94,6 @@ void code_heap::initialize_all_blocks_set() {
 #endif
 }
 
-/* Allocate a code heap during startup */
-void factor_vm::init_code_heap(cell size) { code = new code_heap(size); }
-
 /* Update pointers to words referenced from all code blocks.
 Only needed after redefining an existing word.
 If generic words were redefined, inline caches need to be reset. */

vm/image.cpp

@@ -33,7 +33,7 @@ void factor_vm::load_code_heap(FILE* file, image_header* h, vm_parameters* p) {
   if (h->code_size > p->code_size)
     fatal_error("Code heap too small to fit image", h->code_size);
 
-  init_code_heap(p->code_size);
+  code = new code_heap(p->code_size);
 
   if (h->code_size != 0) {
     size_t bytes_read =

vm/vm.hpp

@@ -587,7 +587,6 @@ struct factor_vm {
     code->allocator->iterate(iter);
   }
 
-  void init_code_heap(cell size);
   void update_code_heap_words(bool reset_inline_caches);
   void initialize_code_blocks();
   void primitive_modify_code_heap();