Remove unnecessary check in OP_SELECT_TUPLE_ARITY

Compiler always emit a OP_IS_TUPLE before OP_SELECT_TUPLE_ARITY.
Replace check with an assert that can be disabled on release builds.

Signed-off-by: Paul Guyot <pguyot@kallisys.net>

Author: pguyot

src/libAtomVM/opcodesswitch.h

@@ -3260,7 +3260,7 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)
                 #endif
 
                 #ifdef IMPL_EXECUTE_LOOP
-                if (LIKELY(term_is_tuple(src_value))) {
+                    assert(term_is_tuple(src_value));
                     int arity = term_get_tuple_arity(src_value);
                 #endif
 
@@ -3280,9 +3280,6 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)
                             }
                         #endif
                     }
-                #ifdef IMPL_EXECUTE_LOOP
-                }
-                #endif
 
                 #ifdef IMPL_EXECUTE_LOOP
                     if (!jump_to_address) {