Separate tagged and untagged pointerless allocations

Tagged allocations can move; untagged allocations cannot.

* libguile/gc-inline.h:
* libguile/gc-malloc.c:
* libguile/gc.h: Split scm_allocate_pointerless into tagged and untagged
variants.
* libguile/bitvectors.c:
* libguile/bytevectors.c:
* libguile/foreign.c:
* libguile/fports.c:
* libguile/integers.c:
* libguile/intrinsics.c:
* libguile/load.c:
* libguile/loader.c:
* libguile/numbers.c:
* libguile/programs.h:
* libguile/random.c:
* libguile/read.c:
* libguile/regex-posix.c:
* libguile/smob.c:
* libguile/strings.c:
* libguile/vm.c: Use the new functions.

libguile/vm.c

@@ -480,7 +480,7 @@ define_vm_builtins (void)
     size_t sz = sizeof (builtin##_code);                                \
     vm_builtin_##builtin##_code = instrumented_code (builtin##_code, sz); \
     struct scm_program *p =                                             \
-      scm_allocate_pointerless (thr, sizeof (struct scm_program));      \
+      scm_allocate_tagged_pointerless (thr, sizeof (*p));               \
     scm_t_bits tag = scm_tc7_program | SCM_F_PROGRAM_IS_PRIMITIVE;      \
     p->tag_flags_and_free_variable_count = tag;                         \
     p->code = vm_builtin_##builtin##_code;                              \