Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/find_code_object_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // 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/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/object.h"
 #include "vm/pages.h"
 #include "vm/stack_frame.h"
@@ skipping 115 matching lines @@
 
   // Now try and access these functions using the code index table.
   Code& code = Code::Handle();
   uword pc;
   OS::SNPrint(buffer, 256, "foo%d", 123);
   function_name = String::New(buffer);
   function = clsA.LookupStaticFunction(function_name);
   EXPECT(!function.IsNull());
   code = function.CurrentCode();
   EXPECT(code.Size() > 16);
-  pc = code.EntryPoint() + 16;
+  pc = code.PayloadStart() + 16;
   EXPECT(Code::LookupCode(pc) == code.raw());
 
   OS::SNPrint(buffer, 256, "moo%d", 54);
   function_name = String::New(buffer);
   function = clsB.LookupStaticFunction(function_name);
   EXPECT(!function.IsNull());
   code = function.CurrentCode();
   EXPECT(code.Size() > 16);
-  pc = code.EntryPoint() + 16;
+  pc = code.PayloadStart() + 16;
   EXPECT(Code::LookupCode(pc) == code.raw());
 
   // Lookup the large function
   OS::SNPrint(buffer, 256, "moo%d", 0);
   function_name = String::New(buffer);
   function = clsB.LookupStaticFunction(function_name);
   EXPECT(!function.IsNull());
   code = function.CurrentCode();
   EXPECT(code.Size() > 16);
-  pc = code.EntryPoint() + 16;
+  pc = code.PayloadStart() + 16;
   EXPECT(code.Size() > (PageSpace::kPageSizeInWords << kWordSizeLog2));
   EXPECT(Code::LookupCode(pc) == code.raw());
   EXPECT(code.Size() > (1 * MB));
-  pc = code.EntryPoint() + (1 * MB);
+  pc = code.PayloadStart() + (1 * MB);
   EXPECT(Code::LookupCode(pc) == code.raw());
 }
 
 }  // namespace dart