API: Change AdjustAmountOfExternalAllocatedMemory calls to use int64_t instead of intptr_t.

Remove deprecated v8::SetResourceConstraints without Isolate parameter.

Remove deprecated v8-defaults.h and defaults.cc. (Chromium issue 312241)

Make it possible to add more than one piece of embedder data to isolates. (Chromium issue 317398)

Performance and stability improvements on all platforms.

git-svn-id: http://v8.googlecode.com/svn/trunk@17953 ce2b1a6d-e550-0410-aec6-3dcde31c8c00