Fixed jump in non-SSE4.1 implementation of LMathFloor instruction on x64.

test/mjsunit/regress/regress-370384.js

+// Copyright 2014 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.
+
+// Flags: --deopt-every-n-times=1 --no-enable_sse4_1
+
+function g(f, x, name) {
+  var v2 = f(x);
+  for (var i = 0; i < 13000; i++) {
+    f(i);
+  }
+  var v1 = f(x);
+  assertEquals(v1, v2);
+}
+
+g(Math.sin, 6.283185307179586, "Math.sin");