Move ref tests under a separate directory and split them based on the type of operation

[ahsan-ca]

This PR re-organizes ref tests. The following ref tests under the
test directory are moved to a separate ref directory under test:

ref_dot_op_test.cpp
ref_loop_test.cpp
ref_ops_nonstd_shape_test.cpp
ref_ops_test.cpp
ref_rnn_ops_test.cpp

Following changes are made to ref tests:

• Tests have been stripped from ref_ops_test.cpp and
  ref_ops_nonstd_shape_test.cpp, and moved to separate
  files based on the type of operation.
  Other ref test files were renamed.

• TEST_CASE blocks having multiple tests have been broken down to have a single test for each TEST_CASE block.

• All the tests under ref are compiled to a single executable.

[codecov]

Codecov Report

Merging #2106 (d0ee111) into develop (53c406b) will not change coverage.
Report is 1 commits behind head on develop.
The diff coverage is n/a.

❗ Current head d0ee111 differs from pull request most recent head b758626. Consider uploading reports for the commit b758626 to get more accurate results

@@           Coverage Diff            @@
##           develop    #2106   +/-   ##
========================================
  Coverage    91.43%   91.43%           
========================================
  Files          422      422           
  Lines        15771    15771           
========================================
  Hits         14420    14420           
  Misses        1351     1351           

[migraphx-bot]

Test	Batch	Rate new b75862	Rate old 53c406	Diff	Compare
torchvision-resnet50	64	2,281.08	2,282.45	-0.06%	✅
torchvision-resnet50_fp16	64	5,350.86	5,335.11	0.30%	✅
torchvision-densenet121	32	1,836.72	1,837.49	-0.04%	✅
torchvision-densenet121_fp16	32	3,395.63	3,384.41	0.33%	✅
torchvision-inceptionv3	32	1,332.13	1,340.57	-0.63%	✅
torchvision-inceptionv3_fp16	32	2,585.40	2,583.12	0.09%	✅
cadene-inceptionv4	16	679.52	679.18	0.05%	✅
cadene-resnext64x4	16	590.63	590.26	0.06%	✅
slim-mobilenet	64	7,216.28	7,205.34	0.15%	✅
slim-nasnetalarge	64	236.72	236.66	0.02%	✅
slim-resnet50v2	64	2,526.32	2,525.02	0.05%	✅
bert-mrpc-onnx	8	720.60	720.82	-0.03%	✅
bert-mrpc-tf	1	390.79	390.57	0.05%	✅
pytorch-examples-wlang-gru	1	303.35	303.94	-0.19%	✅
pytorch-examples-wlang-lstm	1	306.20	314.25	-2.56%	✅
torchvision-resnet50_1	1	556.26	560.67	-0.79%	✅
torchvision-inceptionv3_1	1	306.71	306.12	0.19%	✅
cadene-dpn92_1	1	342.15	348.83	-1.92%	✅
cadene-resnext101_1	1	219.92	220.77	-0.39%	✅
slim-vgg16_1	1	224.25	224.64	-0.18%	✅
slim-mobilenet_1	1	1,473.27	1,458.82	0.99%	✅
slim-inceptionv4_1	1	214.92	224.37	-4.21%	🔴
onnx-taau-downsample	1	247.86	247.60	0.11%	✅
dlrm-criteoterabyte	1	21.66	21.66	-0.00%	✅
dlrm-criteoterabyte_fp16	1	40.59	40.63	-0.08%	✅
agentmodel	1	5,838.50	5,827.23	0.19%	✅
unet_fp16	2	55.08	55.00	0.15%	✅

This build is not recommended to merge 🔴

[migraphx-bot]

    :white_check_mark:bert-mrpc-onnx: PASSED: MIGraphX meets tolerance

    :white_check_mark:bert-mrpc-tf: PASSED: MIGraphX meets tolerance

    :white_check_mark:pytorch-examples-wlang-gru: PASSED: MIGraphX meets tolerance

    :white_check_mark:pytorch-examples-wlang-lstm: PASSED: MIGraphX meets tolerance

    :white_check_mark:torchvision-resnet50_1: PASSED: MIGraphX meets tolerance

🔴torchvision-inceptionv3_1: FAILED: MIGraphX is not within tolerance - check verbose output

🔴cadene-dpn92_1: FAILED: MIGraphX is not within tolerance - check verbose output

    :white_check_mark:cadene-resnext101_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:slim-vgg16_1: PASSED: MIGraphX meets tolerance

    :white_check_mark:slim-mobilenet_1: PASSED: MIGraphX meets tolerance

🔴slim-inceptionv4_1: FAILED: MIGraphX is not within tolerance - check verbose output

    :white_check_mark:dlrm-criteoterabyte: PASSED: MIGraphX meets tolerance

    :white_check_mark:agentmodel: PASSED: MIGraphX meets tolerance

    :white_check_mark:unet: PASSED: MIGraphX meets tolerance

[umangyadav]

Fix CI checks. Otherwise LGTM

[pfultz2]

This should use add_test_executable, otherwise the tests wont be run.

[ahsan-ca]

Thanks for catching that. I have made the change to use add_test_executable.

[pfultz2]

Rest of these lines should already be handles by add_test_executable.

[ahsan-ca]

I switched to use add_test_executable but without target_include_directories(test_ref PUBLIC ../include), it complains that it could not find test.hpp. So I have kept target_include_directories(test_ref PUBLIC ../include).