* no_fork: Performance issue vector of string to T

* style

* WIP

* Fix incorrect CK output adjustment

* Bug fix and enroce sanity check

* Change cycle search depth, and fix sanity check

* cpu_fusion.validate_fuse_gru_inputs passes.

* Fix as_single_output to be able to always create a GOE

* minor fix. style-apply

* Clean up debug msgs

* Switch to backward cycle check

* Enable failing test

* PR fixes

* Address feedback: Add fwd cycle checks. Make cycle checking depth configurable

* [MLIR] Add config files for LIT

LIT is the LLVM testing tool that is used in LLVM and MLIR. It's
necessary to enable all the MLIR testing in nGraph. This will provide
a complementary finer grain level of testing than the one currently done
with gtest. LIT will allow testing each MLIR-based nGraph transformation
without having to run the whole nGraph pipeline. For example, we will be
able to write an nGraph dialect input, invoke an single MLIR transformation
on it and check that the output is the expected.

This PR adds the basic configuration files to enable LIT tool
in nGraph for MLIR Compiler. `affine_lowering/lit_test.mlir` is a
dummy test to exercise the new testing feature. Lit testing will be
enabled in CMAKE in a subsequent PR.

* Address feedback

* [Py] Added operators Shuffle Channels, Squared Difference and Squeeze to Python API.

* [Py] Changed docstring.

* [Py] Changed docstring.

* [Py] Changed docstring.

* Initialize CPU transformer the same way for static and non-static linking.

* Initialize earlier

* Update https links

* Update https links to new ngraph.ai site

* Fix links

* Fix links

* Fix more HTML links

* Reverting CODEOWNER change while we brainstorm on other solutions. As requested by adstraw

Set up visibility support for all the library backends.

* New clang-format rules for src/ngraph/op/util

* Restore root .clang-format

* Remove redundant .clang-formats

* Revert "Remove redundant .clang-formats"

This reverts commit e158df1e507570b55348ce326fd7e8b4ae819f36.

* Remove redundant .clang-formats

* New clang-format rules for src/ngraph/op/fused

* New clang-format rules for src/ngraph/op/experimental

* New clang-format rules for src/ngraph/op/.

* New clang-format rules for src/ngraph/frontend

* Remove now-redundant .clang-format

This PR is a stepping stone towards unifying nGraph MLIRCompiler printing
flags with those used in MLIR. It enables flag -print-ir-after-all
implemented in MLIR pass manager and adds flag -print-ngraph-ir-after-all
to MLIRCompiler so that we can use it to dump IR for those transformations
that we do directly in MLIRCompiler without using a proper pass. Eventually,
everything should be working as a pass and the nGraph variant of the
flag shouldn't be needed. NGRAPH_MLIR_DUMP_ALL macro is no longer
needed.

* Print CK info in visualizer

* style-apply

* Fix parameters printing

*  Fixes

* typo

* [MLIR] Bump MLIR repo 8/20/2019

MLIR_
commit 0cdb20a6add19bc96c20dad28589a1e54e4d8469
Author: Lei Zhang <antiagainst@google.com>
Date:   Tue Aug 20 13:33:41 2019 -0700

    Add spv.specConstant and spv._reference_of

LLVM:
commit 3b9a27b6908040881dad394022f8c472c15c0784
Author: Simon Pilgrim <llvm-dev@redking.me.uk>
Date:   Tue Aug 20 17:54:37 2019 +0000

    Fix typo in comment. NFCI.

* [MLIR] Disable three more tests with MLIR enabled.

This PR disables validate_fuse_gru_inputs, reshape_layout_optimizations4
and reshape_layout_optimizations5:
  1. trivial_in_place_relu_fail: It checks tensors pool offset. There is
     no memory pool in MLIR atm.
  2. validate_fuse_gru_inputs: It creates an infinite cycle in
     MLIR subgraph extraction pass (under investigation).
  3. reshape_layout_optimizations4/5: They fail due to CompiledKernel
     being not expected by CPULayout pass.

* Disable cpu_quant_fusion.qconcat

* [MLIR] Bump MLIR repo 8/20/2019

MLIR_
commit 0cdb20a6add19bc96c20dad28589a1e54e4d8469
Author: Lei Zhang <antiagainst@google.com>
Date:   Tue Aug 20 13:33:41 2019 -0700

    Add spv.specConstant and spv._reference_of

LLVM:
commit 3b9a27b6908040881dad394022f8c472c15c0784
Author: Simon Pilgrim <llvm-dev@redking.me.uk>
Date:   Tue Aug 20 17:54:37 2019 +0000

    Fix typo in comment. NFCI.

* Address Bob's feedback

* Segregate builders op wise

* Style

* Update ngraph.hpp

Modifying CI interface

Static type holders can be initialized after things that make copies of them
are run, leading to `undefined` as the type in the copies.

* Plant an updated .clang-format in src/ngraph, with overrides in each subdir thereof

* Whoops, forgot to commit the actual .clang-formats

* Remove src/ngraph/type/.clang-format (it was having no effect)

* Remove src/ngraph/distributed/.clang-format (it was having no effect)

* Remove src/ngraph/codegen/.clang-format (only one file was affected, so it's a wash)

* Remove src/ngraph/autodiff/.clang-format (only one file was affected, so it's a wash)

* Un-relax comment wrapping in src/ngraph/state

* Revert "Un-relax comment wrapping in src/ngraph/state"

This reverts commit 41fc50fb92bffb7f5aca4126eb1267f00dcca727.

* Un-relax comment wrapping in src/ngraph/runtime, not including src/ngraph/runtime/{cpu, gpu, plaidml, reference}

* Enable new clang-format comment rules for src/ngraph/runtime/{dynamic,generic_cpu,gpuh,interpreter,nop}

* Update clang-format comment rules for GPU BE

* Update clang-format comment rules for src/ngraph/runtime/plaidml

* Update clang-format comment rules for src/ngraph/runtime/intelgpu

* Fix a couple of demangles I missed

* rm zombie .clang-format files

* rm zombie .clang-format files

* Update CODEOWNERS

* Update CODEOWNERS

* Update CODEOWNERS

* Kill zombie .clang-format files

* Undo CODEOWNERS change

* New clang-format rules for src/ngraph/op/util

* Restore root .clang-format

* Remove redundant .clang-formats

* Revert "Remove redundant .clang-formats"

This reverts commit e158df1e507570b55348ce326fd7e8b4ae819f36.

* Remove redundant .clang-formats