[turbofan] Make sure there is space for lazy deopt patching before the constant pool.

test/mjsunit/compiler/regress-446647.js

 // Copyright 2015 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.
 
-Error.prepareStackTrace = function(dummyObject, v8StackTrace)
-{
-  throw new Error('boom');
+// Flags: --always-opt --turbo-filter=* --turbo-deoptimization --allow-natives-syntax
+
+function f(a,b) {
+  a%b
 };
 
-
-throw new Error('just error');
+f({ toString : function() { %DeoptimizeFunction(f); }});