TensorFlow: upstream changes to git

Change 109366961
	TensorFlow BUILD: now that we have an ops library,
	set linkstatic to 1. This fixes a breakage in the would-be
	opensource build, and it *might* mean we can get rid of
	all of the RequireDefaultOps() calls in our code.

	The ops library is much smaller than the kernels library that was
	previously linked together.  We set linkstatic=0 presumably since we
	didn't want to package a static copy of the kernels (very large)
	everywhere.  But the op definitions are small, so this seems like a
	safe change to make.  Time to build the various tests was not
	any longer after this change, and inspecting the example_trainer
	binary showed no large increase.
Change 109363613
	TensorFlow: new graph_def_builder_test needs to RequireDefaultOps.
Change 109362569
	Split ":ops" out of ":kernels" target in tensorflow/core.
Change 109360666
	Catch dtype and some shape errors sooner in `QueueBase`.

	Some avoidable errors were not being caught (e.g. the dtypes of the
	enqueue components were not checked against the queue's dtypes in
	Python), leading to cryptic messages at runtime. After this CL, they
	will be caught earlier.
Change 109359569
	TensorFlow: Expect g_ != nullptr in test
Change 109350735
	Add a version number to GraphDef

	We would like to be able to deprecate behavior in newly generated graphs
	without invalidating tensorflow's ability to read and evaluate old graphs.
	For this purpose, GraphDef now has a version field which can be checked inside
	op kernels to determine how backwards compatible to be.  version.h defines
	TF_GRAPHDEF_VERSION_MIN and TF_GRAPHDEF_VERSION_MAX specifying the range of
	supported GraphDef versions in the current version of tensorflow.

	Also expose tf.__version__ and tf.__graph_def_version{,_min,_max}__ for Python
	interrogation purposes.

	Whenever we want to deprecate or change some GraphDef semantics, we will
	proceed as follows:

	1. Bump TF_GRAPHDEF_VERSION_MAX, leaving TF_GRAPHDEF_VERSION_MIN unchanged.
	   Describe the change in graph.proto, include the date introduced.

	2. In each relevant kernel, implement the new behavior if the GraphDef version
	   is new, but preserve the old behavior for previous GraphDef versions.

	3. Wait six months or so (we need to formalize this somewhere).

	4. Bump TF_GRAPHDEF_VERSION_MIN and remove the backwards compatibility.

	The GraphDef version is distinct from the open source version, but at least
	(4) and possibly (1) correspond to major version number bumps.

	The first GraphDef version bump is the upcoming scalar strictness change,
	which affects Google users only since open source is already scalar strict.

	This commit does not yet plumb the version number into OpKernelConstruction
	so that ops can access it.  That will follow.
Change 109350260
	Made TensorShapeProto implicitly convertible to TensorShape.

Base CL: 109366982

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