The Global Load IC doesn't yet play well with --vector-ics.

src/ic/ic.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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/bits.h"
@@ skipping 933 matching lines @@
   if (FLAG_vector_ics) {
     return LoadICTrampolineStub(isolate, LoadICState(extra_state)).GetCode();
   }
 
   return PropertyICCompiler::ComputeLoad(isolate, UNINITIALIZED, extra_state);
 }
 
 
 Handle<Code> LoadIC::load_global(Isolate* isolate, Handle<GlobalObject> global,
                                  Handle<String> name) {
+  // This special IC doesn't work with vector ics.
+  DCHECK(!FLAG_vector_ics);
+
   Handle<ScriptContextTable> script_contexts(
       global->native_context()->script_context_table());
 
   ScriptContextTable::LookupResult lookup_result;
   if (ScriptContextTable::Lookup(script_contexts, name, &lookup_result)) {
     return initialize_stub(isolate, LoadICState(CONTEXTUAL).GetExtraICState());
   }
 
   Handle<Map> global_map(global->map());
   Handle<Code> handler = PropertyHandlerCompiler::Find(
@@ skipping 2081 matching lines @@
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR) NULL
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) { return IC_utilities[id]; }
 }
 }  // namespace v8::internal