[turbofan] Fix accumulator use in bytecode analysis.

test/mjsunit/regress/regress-crbug-683581.js

Index: test/mjsunit/regress/regress-crbug-683581.js
diff --git a/test/mjsunit/regress/regress-crbug-683581.js b/test/mjsunit/regress/regress-crbug-683581.js
new file mode 100644
index 0000000000000000000000000000000000000000..6b6c54b4a8bc00f5e6f92148ebe0aa6b8a9a7f1f
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-683581.js
@@ -0,0 +1,13 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var v = 0;
+function foo() {
+  for (var i = 0; i < 70000; i++) {
+    v += i;
+  }
+  eval();
+}
+foo()
+assertEquals(2449965000, v);