MJIT: s/assert/VM_ASSERT/

include/ruby/assert.h sets NDEBUG by default.
As MJIT CI uses -DVM_CHECK_MODE, using only VM_ASSERT might be more
helpful.

mjit.c

@@ -484,7 +484,7 @@ rb_mjit_wait_call(rb_execution_context_t *ec, struct rb_iseq_constant_body *body
 struct rb_mjit_compile_info*
 rb_mjit_iseq_compile_info(const struct rb_iseq_constant_body *body)
 {
-    assert(body->jit_unit != NULL);
+    VM_ASSERT(body->jit_unit != NULL);
     return &body->jit_unit->compile_info;
 }
 
@@ -496,7 +496,7 @@ mjit_recompile(const rb_iseq_t *iseq)
 
     verbose(1, "JIT recompile: %s@%s:%d", RSTRING_PTR(ISEQ_BODY(iseq)->location.label),
             RSTRING_PTR(rb_iseq_path(iseq)), FIX2INT(ISEQ_BODY(iseq)->location.first_lineno));
-    assert(ISEQ_BODY(iseq)->jit_unit != NULL);
+    VM_ASSERT(ISEQ_BODY(iseq)->jit_unit != NULL);
 
     mjit_add_iseq_to_process(iseq, &ISEQ_BODY(iseq)->jit_unit->compile_info, true);
     check_unit_queue();

mjit_worker.c

@@ -1235,7 +1235,7 @@ unload_units(void)
 
     // Detect units which are in use and can't be unloaded.
     ccan_list_for_each(&active_units.head, unit, unode) {
-        assert(unit->iseq != NULL && unit->handle != NULL);
+        VM_ASSERT(unit->iseq != NULL && unit->handle != NULL);
         unit->used_code_p = false;
     }
     // All threads have a root_fiber which has a mjit_cont. Other normal fibers also
@@ -1267,7 +1267,7 @@ unload_units(void)
             if (max_queue_calls > ISEQ_BODY(unit->iseq)->total_calls) {
                 verbose(2, "Unloading unit %d (calls=%lu, threshold=%lu)",
                         unit->id, ISEQ_BODY(unit->iseq)->total_calls, max_queue_calls);
-                assert(unit->handle != NULL);
+                VM_ASSERT(unit->handle != NULL);
                 remove_from_list(unit, &active_units);
                 free_unit(unit);
                 unloaded_p = true;