Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/flow_graph_compiler_ia32.cc

 // Copyright (c) 2013, 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 "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1291 matching lines @@
     __ CompareClassId(EBX, kOneByteStringCid, EAX);
     __ j(NOT_EQUAL, &megamorphic_call, Assembler::kNearJump);
     __ movl(EAX, FieldAddress(EBX, String::hash_offset()));
     __ cmpl(EAX, Immediate(0));
     __ j(NOT_EQUAL, &done, Assembler::kNearJump);
 
     __ Bind(&megamorphic_call);
     __ Comment("Slow case: megamorphic call");
   }
   __ LoadObject(ECX, cache);
-  __ call(Address(THR, Thread::megamorphic_lookup_entry_point_offset()));
+  __ call(Address(THR, Thread::megamorphic_lookup_checked_entry_offset()));
   __ call(EBX);
 
   __ Bind(&done);
   AddCurrentDescriptor(RawPcDescriptors::kOther,
       Thread::kNoDeoptId, token_pos);
   RecordSafepoint(locs, slow_path_argument_count);
   const intptr_t deopt_id_after = Thread::ToDeoptAfter(deopt_id);
   // Precompilation not implemented on ia32 platform.
   ASSERT(!FLAG_precompiled_mode);
   if (is_optimizing()) {
@@ skipping 537 matching lines @@
   __ movups(reg, Address(ESP, 0));
   __ addl(ESP, Immediate(kFpuRegisterSize));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32