* Upgrade MKLDNN to v0.18-rc and fix issue caused by lib/lib64

Upgrade MKLDNN to v0.18-rc
Also fix the issue during upgrade

test=develop

* Rebase MKLDNN to rls-v0.18 branch

Some issues in v0.18-rc which caused INT8 conv op unit test failure was fixed
in rls-v0.18 branch

test=develop

* Upgrade MKLDNN from v0.18rc to formal v0.18 tag

test=develop

* Fix the windows compile issue.

test=develop

test=develop

test=develop

test=develop

* Refine Dockerfile

* Add tasks, cmake gen

* Fix code error

* Disable compile after paddle_build.sh

* Refine

* Skip on PY35 CI

* Change env

* Refine paddle_build.sh

* Expose gen_fluid_lib

* Refine mkldnn.cmake

* Refine mkldnn.cmake

* Refine mkldnnlib

* Skip unstable tests

test=develop

test=develop

Fixed problem with array subscript is above array bounds in MKL-DNN jit_uni_reorder_utils.cpp:prb_simplify function

test=develop

test=develop

- Added hash function inside of MKLDNN softmax op to be used as handle for primitives stroing in a
context

- Style fixes to softmax mkldnn op

- Fixes after review

- Coding style

- Fix to style

- style fixes

- style fix

- style fixes

- Fix to cody style check

- Rephrasing a comment

fix t obroken merge

Fixes to rebase

Conflicts:
	benchmark/fluid/models/machine_translation.py
	cmake/external/mkldnn.cmake
	paddle/fluid/operators/softmax_mkldnn_op.cc

- Bumped revision of MKL-DNN up to have softmax backward primitive

- Added choosing MKLDNN softmax grad operator

- First reuse of softmax backward

- Reinvented reusing for softmax

- Fix to crash in reinvented reuse

- Clang format fixes

- Clang format fixes

- Improved softmax mkldnn reuse mechanism

- clang format fixes

- Fix to broken merge

- Fix

* test_patch_mkldnn

* use patch file

* follow comments

* fix patch

disable building tests and examples when install mkldnn
skip -Werror=unused-result

and abandoned deprecated sum API interface

and disable both when build doc and MacOS