Revert "JIT: fix inline allocation for large vectors"

This reverts commit ce9894c8bf.

I don't immediately see what has gone wrong, so reverting for now.

pkgs/racket-test-core/tests/racket/jitinline.rktl

@@ -914,18 +914,6 @@
 
     ))
 
-;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-;; Make sure that the JIT doesn't try to inline
-;; a vector allocation that is too large
-
-(parameterize ([current-namespace (make-base-namespace)])
-  (let loop ([i 10])
-    ((eval `(lambda (x) (vector x ,@(for/list ([j (in-range i)])
-                                      j))))
-     i)
-    (when (i . < . 100000)
-      (loop (floor (* i #e1.25))))))
-
 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 ;; Check JIT handling of structure-reference sequences

racket/src/racket/src/jitinline.c

@@ -5250,10 +5250,7 @@ static int generate_vector_alloc(mz_jit_state *jitter, Scheme_Object *rator,
     c = 2;
   } else {
     c = app->num_args;
-    if (c > 256) {
+    if (c)
-      /* Too big for inline alloc */
-      return scheme_generate_app(app, NULL, c, c, jitter, 0, 0, 0, 0);
-    } else if (c)
       scheme_generate_app(app, NULL, c, c, jitter, 0, 0, 0, 2);  /* sync'd below */
   }
   CHECK_LIMIT();