Mode as enum for pooling and roi_align (#1091)

Changed the pooling values for two structures from strings to specialized enum classes. Many test and operator parsing changes to support this. Introduces one new source file, op_enums.cpp.

test/verify/test_max_pooling_ceil_3d.cpp

@@ -12,7 +12,8 @@ struct test_max_pooling_ceil_3d : verify_program<test_max_pooling_ceil_3d>
         auto* mm = p.get_main_module();
         auto input =
             mm->add_parameter("x", migraphx::shape{migraphx::shape::float_type, {1, 3, 5, 5, 5}});
-        auto op = migraphx::op::pooling{"max", {1, 1, 1}, {3, 3, 3}, {3, 3, 3}, true};
+        auto op = migraphx::op::pooling{
+            migraphx::op::pooling_mode::max, {1, 1, 1}, {3, 3, 3}, {3, 3, 3}, true};
         mm->add_instruction(op, input);
         return p;
     }

test/verify/test_pooling_autopad.cpp

@@ -12,7 +12,7 @@ struct test_pooling_autopad : verify_program<test_pooling_autopad>
         auto* mm = p.get_main_module();
         migraphx::shape s0{migraphx::shape::float_type, {1, 3, 63, 63}};
         auto l0 = mm->add_parameter("x", s0);
-        migraphx::op::pooling op{"max"};
+        migraphx::op::pooling op{migraphx::op::pooling_mode::max};
         op.lengths = {2, 2};
         op.stride  = {2, 2};
         mm->add_instruction(op, l0);

test/verify/test_roialign_nondefault.cpp

@@ -3,6 +3,7 @@
 #include <migraphx/program.hpp>
 #include <migraphx/generate.hpp>
 #include <migraphx/make_op.hpp>
+#include <migraphx/op/common.hpp>
 
 struct test_roialign_nondefault : verify_program<test_roialign_nondefault>
 {
@@ -23,7 +24,7 @@ struct test_roialign_nondefault : verify_program<test_roialign_nondefault>
         auto r   = mm->add_instruction(
             migraphx::make_op("roialign",
                               {{"coordinate_transformation_mode", "output_half_pixel"},
-                               {"mode", "max"},
+                               {"mode", migraphx::op::pooling_mode::max},
                                {"spatial_scale", 1.0},
                                {"output_height", 5},
                                {"output_width", 5},