VM: Re-format to use at most one newline between functions

runtime/vm/bit_set_test.cc

Index: runtime/vm/bit_set_test.cc
diff --git a/runtime/vm/bit_set_test.cc b/runtime/vm/bit_set_test.cc
index 432d0864a1904ba303c98aadc810547da6c9310d..32957702c7a572b03b01eda99f7342e1c9fa7e9c 100644
--- a/runtime/vm/bit_set_test.cc
+++ b/runtime/vm/bit_set_test.cc
@@ -2,8 +2,8 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#include "platform/assert.h"
 #include "vm/bit_set.h"
+#include "platform/assert.h"
 #include "vm/unit_test.h"
 
 namespace dart {
@@ -40,7 +40,6 @@ void TestBitSet() {
   }
 }
 
-
 TEST_CASE(BitSetBasic) {
   TestBitSet<8>();
   TestBitSet<42>();