Correct a misuse of sizeof (introduced in r22709).

src/runtime.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 <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 15573 matching lines @@
   if (entry != kNotFound) {
     Object* smi_index = heap->intrinsic_function_names()->ValueAt(entry);
     int function_index = Smi::cast(smi_index)->value();
     return &(kIntrinsicFunctions[function_index]);
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForEntry(Address entry) {
-  for (size_t i = 0; i < sizeof(kIntrinsicFunctions); ++i) {
+  size_t length = sizeof(kIntrinsicFunctions) / sizeof(*kIntrinsicFunctions);
+  for (size_t i = 0; i < length; ++i) {
     if (entry == kIntrinsicFunctions[i].entry) {
       return &(kIntrinsicFunctions[i]);
     }
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal