Fix interaction between profiler hooks and finalizers.

Thanks to Julien Desgats.

src/lj_gc.c

@@ -466,6 +466,7 @@ static void gc_call_finalizer(global_State *g, lua_State *L,
   TValue *top;
   lj_trace_abort(g);
   hook_entergc(g);  /* Disable hooks and new traces during __gc. */
+  if (LJ_HASPROFILE && (oldh & HOOK_PROFILE)) lj_dispatch_update(g);
   g->gc.threshold = LJ_MAX_MEM;  /* Prevent GC steps. */
   top = L->top;
   copyTV(L, top++, mo);
@@ -474,6 +475,7 @@ static void gc_call_finalizer(global_State *g, lua_State *L,
   L->top = top+1;
   errcode = lj_vm_pcall(L, top, 1+0, -1);  /* Stack: |mo|o| -> | */
   hook_restore(g, oldh);
+  if (LJ_HASPROFILE && (oldh & HOOK_PROFILE)) lj_dispatch_update(g);
   g->gc.threshold = oldt;  /* Restore GC threshold. */
   if (errcode)
     lj_err_throw(L, errcode);  /* Propagate errors. */

src/lj_obj.h

@@ -638,7 +638,8 @@ typedef struct global_State {
 #define HOOK_PROFILE		0x80
 #define hook_active(g)		((g)->hookmask & HOOK_ACTIVE)
 #define hook_enter(g)		((g)->hookmask |= HOOK_ACTIVE)
-#define hook_entergc(g)		((g)->hookmask |= (HOOK_ACTIVE|HOOK_GC))
+#define hook_entergc(g) \
+  ((g)->hookmask = ((g)->hookmask | (HOOK_ACTIVE|HOOK_GC)) & ~HOOK_PROFILE)
 #define hook_vmevent(g)		((g)->hookmask |= (HOOK_ACTIVE|HOOK_VMEVENT))
 #define hook_leave(g)		((g)->hookmask &= ~HOOK_ACTIVE)
 #define hook_save(g)		((g)->hookmask & ~HOOK_EVENTMASK)

src/lj_profile.c

@@ -153,7 +153,7 @@ static void profile_trigger(ProfileState *ps)
   profile_lock(ps);
   ps->samples++;  /* Always increment number of samples. */
   mask = g->hookmask;
-  if (!(mask & (HOOK_PROFILE|HOOK_VMEVENT))) {  /* Set profile hook. */
+  if (!(mask & (HOOK_PROFILE|HOOK_VMEVENT|HOOK_GC))) {  /* Set profile hook. */
     int st = g->vmstate;
     ps->vmstate = st >= 0 ? 'N' :
 		  st == ~LJ_VMST_INTERP ? 'I' :