Revert "Upgrade V8 to 2.3.7"

This reverts commit 083ee0f8b7a8d98d51bf2debf47d68117f13087f.

V8 build broken on cygwin:
  ./deps/v8/src/handles.h:62: instantiated from `T*
  v8::internal::Handle<T>::operator->() const [with T = v8::internal::Code]'
  ./deps/v8/src/accessors.cc:396: instantiated from here
  ./deps/v8/src/handles-inl.h:50:
  error: call of overloaded `BitCast(v8::internal::Code** const&)' is
  ambiguous
  ./deps/v8/src/utils.h:732: note: candidates are: Dest
  v8::internal::BitCast(const Source&) [with Dest = v8::internal::Code**,
  Source = v8::internal::Code**]
  ./deps/v8/src/utils.h:743:
  note:                 Dest v8::internal::BitCast(Source* const&) [with Dest
  = v8::internal::Code**, Source = v8::internal::Code*]
  scons: *** [obj/release/accessors.o] Error 1

1 files changed, 3 insertions, 3 deletions

diff --git a/deps/v8/src/heap-profiler.cc b/deps/v8/src/heap-profiler.cc
index 7668bbc150..92ded7b347 100644
--- a/deps/v8/src/heap-profiler.cc
+++ b/deps/v8/src/heap-profiler.cc
@@ -111,10 +111,10 @@ int Clusterizer::CalculateNetworkSize(JSObject* obj) {
   int size = obj->Size();
   // If 'properties' and 'elements' are non-empty (thus, non-shared),
   // take their size into account.
-  if (obj->properties() != Heap::empty_fixed_array()) {
+  if (FixedArray::cast(obj->properties())->length() != 0) {
     size += obj->properties()->Size();
   }
-  if (obj->elements() != Heap::empty_fixed_array()) {
+  if (FixedArray::cast(obj->elements())->length() != 0) {
     size += obj->elements()->Size();
   }
   // For functions, also account non-empty context and literals sizes.
@@ -360,7 +360,7 @@ HeapSnapshot* HeapProfiler::TakeSnapshot(String* name) {
 
 
 HeapSnapshot* HeapProfiler::TakeSnapshotImpl(const char* name) {
-  Heap::CollectAllGarbage(true);
+  Heap::CollectAllGarbage(false);
   HeapSnapshot* result = snapshots_->NewSnapshot(name, next_snapshot_uid_++);
   HeapSnapshotGenerator generator(result);
   generator.GenerateSnapshot();