Use a dictionary-mode code cache on the map rather than a dual system.

src/ic/ia32/stub-cache-ia32.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/codegen.h"
 #include "src/ic/ic.h"
 #include "src/ic/stub-cache.h"
 #include "src/interface-descriptors.h"
@@ skipping 135 matching lines @@
 void StubCache::GenerateProbe(MacroAssembler* masm, Code::Kind ic_kind,
                               Code::Flags flags, Register receiver,
                               Register name, Register scratch, Register extra,
                               Register extra2, Register extra3) {
   Label miss;
 
   // Assert that code is valid.  The multiplying code relies on the entry size
   // being 12.
   DCHECK(sizeof(Entry) == 12);
 
-  // Assert the flags do not name a specific type.
-  DCHECK(Code::ExtractTypeFromFlags(flags) == 0);
-
   // Assert that there are no register conflicts.
   DCHECK(!scratch.is(receiver));
   DCHECK(!scratch.is(name));
   DCHECK(!extra.is(receiver));
   DCHECK(!extra.is(name));
   DCHECK(!extra.is(scratch));
 
   // Assert scratch and extra registers are valid, and extra2/3 are unused.
   DCHECK(!scratch.is(no_reg));
   DCHECK(extra2.is(no_reg));
@@ skipping 41 matching lines @@
   __ bind(&miss);
   __ IncrementCounter(counters->megamorphic_stub_cache_misses(), 1);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32