mjit_compile.c: disable stack consistency check

This should be basically safe because VM already does this check.
I don't think JIT-ed code, which should be specially optimized, should
still do this.

* Benchmark

Calculating -------------------------------------
                         before  before,--jit  after,--jit
           optcarrot     53.851        68.050       71.641 fps

Comparison:
                        optcarrot
         after,--jit:        71.6 fps
        before,--jit:        68.1 fps - 1.05x  slower
              before:        53.9 fps - 1.33x  slower

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63092 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

mjit_compile.c

@@ -180,6 +180,11 @@ mjit_compile(FILE *f, const struct rb_iseq_constant_body *body, const char *func
     status.compiled_for_pos = ZALLOC_N(int, body->iseq_size);
     status.local_stack_p = !body->catch_except_p;
 
+    if (!mjit_opts.debug) {
+        fprintf(f, "#undef OPT_CHECKED_RUN\n");
+        fprintf(f, "#define OPT_CHECKED_RUN 0\n\n");
+    }
+
 #ifdef _WIN32
     fprintf(f, "__declspec(dllexport)\n");
 #endif