Add a debug_counter for JIT cancel on leave

debug_counter.h

@@ -333,6 +333,7 @@ RB_DEBUG_COUNTER(mjit_cancel_exivar_inline)
 RB_DEBUG_COUNTER(mjit_cancel_send_inline)
 RB_DEBUG_COUNTER(mjit_cancel_opt_insn) /* CALL_SIMPLE_METHOD */
 RB_DEBUG_COUNTER(mjit_cancel_invalidate_all)
+RB_DEBUG_COUNTER(mjit_cancel_leave)
 
 /* rb_mjit_unit_list length */
 RB_DEBUG_COUNTER(mjit_length_unit_queue)

tool/ruby_vm/views/mjit_compile.inc.erb

@@ -76,6 +76,7 @@ switch (insn) {
           fprintf(f, "    if (UNLIKELY(RUBY_VM_INTERRUPTED_ANY(ec))) {\n");
           fprintf(f, "        reg_cfp->sp = vm_base_ptr(reg_cfp) + %d;\n", b->stack_size);
           fprintf(f, "        reg_cfp->pc = original_body_iseq + %d;\n", pos);
+          fprintf(f, "        RB_DEBUG_COUNTER_INC(mjit_cancel_leave);\n");
           fprintf(f, "        goto cancel;\n");
           fprintf(f, "    }\n");
           fprintf(f, "    ec->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(reg_cfp);\n"); // vm_pop_frame