Add I_HOLD_LOCK assertion to expand_hp_inner and related functions

(code refactoring)

* alloc.c (GC_expand_hp_inner, GC_collect_or_expand): Add
GC_ASSERT(I_HOLD_LOCK()) at the beginning of the function.
* obj_map.c (GC_register_displacement_inner): Likewise.

1 files changed, 1 insertions, 0 deletions

diff --git a/obj_map.c b/obj_map.c
index 9fdeb0af..d332254e 100644
--- a/obj_map.c
+++ b/obj_map.c
@@ -35,6 +35,7 @@ GC_API void GC_CALL GC_register_displacement(size_t offset)
 
 GC_INNER void GC_register_displacement_inner(size_t offset)
 {
+    GC_ASSERT(I_HOLD_LOCK());
     if (offset >= VALID_OFFSET_SZ) {
         ABORT("Bad argument to GC_register_displacement");
     }