use a hash table for the function cache as blink is leaking functiontemplates

src/contexts.h

 // 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.
 
 #ifndef V8_CONTEXTS_H_
 #define V8_CONTEXTS_H_
 
 #include "src/heap/heap.h"
 #include "src/objects.h"
 
@@ skipping 122 matching lines @@
   V(STRONG_CONSTRUCTOR_MAP_INDEX, Map, strong_constructor_map)                 \
   V(BOUND_FUNCTION_MAP_INDEX, Map, bound_function_map)                         \
   V(REGEXP_RESULT_MAP_INDEX, Map, regexp_result_map)                           \
   V(SLOPPY_ARGUMENTS_MAP_INDEX, Map, sloppy_arguments_map)                     \
   V(ALIASED_ARGUMENTS_MAP_INDEX, Map, aliased_arguments_map)                   \
   V(STRICT_ARGUMENTS_MAP_INDEX, Map, strict_arguments_map)                     \
   V(MESSAGE_LISTENERS_INDEX, JSObject, message_listeners)                      \
   V(MAKE_MESSAGE_FUN_INDEX, JSFunction, make_message_fun)                      \
   V(GET_STACK_TRACE_LINE_INDEX, JSFunction, get_stack_trace_line_fun)          \
   V(CONFIGURE_GLOBAL_INDEX, JSFunction, configure_global_fun)                  \
-  V(FUNCTION_CACHE_INDEX, FixedArray, function_cache)                          \
+  V(FUNCTION_CACHE_INDEX, ObjectHashTable, function_cache)                     \
   V(JSFUNCTION_RESULT_CACHES_INDEX, FixedArray, jsfunction_result_caches)      \
   V(NORMALIZED_MAP_CACHE_INDEX, Object, normalized_map_cache)                  \
   V(RUNTIME_CONTEXT_INDEX, Context, runtime_context)                           \
   V(CALL_AS_FUNCTION_DELEGATE_INDEX, JSFunction, call_as_function_delegate)    \
   V(CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, JSFunction,                            \
     call_as_constructor_delegate)                                              \
   V(SCRIPT_FUNCTION_INDEX, JSFunction, script_function)                        \
   V(OPAQUE_REFERENCE_FUNCTION_INDEX, JSFunction, opaque_reference_function)    \
   V(CONTEXT_EXTENSION_FUNCTION_INDEX, JSFunction, context_extension_function)  \
   V(MAP_CACHE_INDEX, Object, map_cache)                                        \
@@ skipping 467 matching lines @@
   static bool IsBootstrappingOrGlobalObject(Isolate* isolate, Object* object);
 #endif
 
   STATIC_ASSERT(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_ASSERT(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_