Add two test cases using the given example in the onnx Gather documentation

Generates output from the given onnx description of gather found here:
https://github.com/onnx/onnx/blob/main/docs/Operators.md#gather

Using this as a baseline as I seem to pass on the zero case but fail on the
axis = 1 case. In the other tests of shape (3,3) there appears to be a similar
error when axis = -1 which after tuning is axis = 1.

test/verify/test_gather_onnx_axis_one_ex.cpp

+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015-2022 Advanced Micro Devices, Inc. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "verify_program.hpp"
+#include <migraphx/program.hpp>
+#include <migraphx/generate.hpp>
+#include <migraphx/make_op.hpp>
+
+/* Test case mirrors the example for for axis = 1 found on the onnx gather documentation */
+struct test_gather_onnx_axis_one_ex : verify_program<test_gather_onnx_axis_one_ex>
+{
+    migraphx::program create_program() const
+    {
+        migraphx::program p;
+        auto* mm = p.get_main_module();
+        migraphx::shape s{migraphx::shape::float_type, {3, 2}};
+        migraphx::shape s_indices{migraphx::shape::int32_type, {2, 1}};
+        std::vector<int> indices{0, 2};
+        auto a0  = mm->add_parameter("data", s);
+        auto a1  = mm->add_literal(migraphx::literal{s_indices, indices});
+        int axis = 1;
+        mm->add_instruction(migraphx::make_op("gather", {{"axis", axis}}), a0, a1);
+        return p;
+    }
+};

test/verify/test_gather_onnx_axis_zero_ex.cpp

+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015-2022 Advanced Micro Devices, Inc. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "verify_program.hpp"
+#include <migraphx/program.hpp>
+#include <migraphx/generate.hpp>
+#include <migraphx/make_op.hpp>
+
+/* Test case mirrors the example for for axis = 0 found on the onnx gather documentation */
+struct test_gather_onnx_axis_zero_ex : verify_program<test_gather_onnx_axis_zero_ex>
+{
+    migraphx::program create_program() const
+    {
+        migraphx::program p;
+        auto* mm = p.get_main_module();
+        migraphx::shape s{migraphx::shape::float_type, {3, 2}};
+        migraphx::shape s_indices{migraphx::shape::int32_type, {2, 2}};
+        std::vector<int> indices{0, 1, 1, 2};
+        auto a0  = mm->add_parameter("data", s);
+        auto a1  = mm->add_literal(migraphx::literal{s_indices, indices});
+        int axis = 0;
+        mm->add_instruction(migraphx::make_op("gather", {{"axis", axis}}), a0, a1);
+        return p;
+    }
+};