Fix some stub calling asserts on x64.

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 9304)
+++ src/heap.cc	(working copy)
@@ -2056,6 +2056,15 @@
   // To workaround the problem, make separate functions without inlining.
   Heap::CreateJSEntryStub();
   Heap::CreateJSConstructEntryStub();
+
+  // Create stubs that should be there, so we don't unexpectedly have to
+  // create them if we need them during the creation of another stub.
+  // Stub creation mixes raw pointers and handles in an unsafe manner so
+  // we cannot create stubs while we are creating stubs.
+  CEntryStub ces(1);
+  ces.GetCode();
+
+  CodeStub::GenerateStubsAheadOfTime();
 }