harmful optimization.

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  internal object support.
  If given object `obj' has references to internal objects
  (such as T_NODE objects), then this method returns instances of
  `ObjectSpace::InternalObjectWrapper' instead of that internal objects.
  This instance contains a refereance to an internal object and you can
  check the type of internal object using
  `ObjectSpace::InternalObjectWrapper#type' method.
  Rdoc of `InternalObjectWrapper' is not prepared yet.
* gc.c (rb_objspace_reachable_objects_from), gc.h: change
  an interface of 'rb_objspace_reachable_objects_from()'
* gc.c, gc.h: add two APIs
  - rb_objspace_markable_object_p(obj): check markable or not.
  - rb_objspace_internal_object_p(obj): check internal or not.



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  This method returns an array of objects referenced by given object.
  If given object is special objects such as true/false/nil/Fixnum etc
  then it returns nil. See rdoc for details.
  [ruby-core:39772]
* test/objspace/test_objspace.rb: add a test for this method.
* gc.c: add rb_objspace_reachable_objects_from().
  To make this function, add several member `mark_func_data'
  to rb_objspace_t.  If mark_func_data is not null, then
  gc_mark() calls mark_func_data::mark_func.
* gc.h: export rb_objspace_reachable_objects_from().



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* gc.h (IS_STACK_DIR_UPPER): utility macro.


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Patch by Google Inc. [ruby-core:45073].

* configure.in (RUBY_NACL): New M4 func to configure variables for
  NaCl.
  (RUBY_NACL_CHECK_PEPPER_TYPES): New M4 func to check the old names
  of Pepper interface types.
  (BTESTRUBY): New variable to specify which ruby should be run on
  "make btest". NaCl can run the built binary by sel_ldr, but it need
  rbconfig.rb. So this variable is distinguished from $MINIRUBY.
  
* thread_pthread.c: Disabled some features on NaCl.

* io.c: ditto.

* process.c: ditto.

* signal.c: ditto.

* file.c: ditto.

* missing/flock.c: ditto.

* nacl/pepper_main.c: An example implementation of Pepper application
  that embeds Ruby.

* nacl/example.html: An example of web page that uses the Pepper
  application.

* nacl/nacl-config.rb: Detects variants of NaCl SDK.

* nacl/GNUmakefile.in: Makefile template for NaCl specific build
  process.

* nacl/package.rb: script for packaging a NaCl-Ruby embedding
  application. 

* nacl/reate_nmf.rb: Wrapper script of create_nmf.py

* dln.c (dln_load): Added a hack to call on NaCl.

* util.c (ruby_getcwd): Path to the current directort is not available
  on NaCl.



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* gc.h (RUBY_FREE_UNLESS_NULL): get rid of double free.
  [ruby-core:35192]

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  STACK_UPPER macro instead.

* gc.h (STACK_DIR_UPPER): moved from thread_pthread.c.


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  Satoshi Shiba <shiba AT rvm.jp> at [ruby-dev:40973].

* gc.h (ruby_get_stack_grow_direction): fixed prototype.

* thread_pthread.c (get_stack, ruby_stack_overflowed_p): both side
  should be same type.  [Bug #3145]


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