Add another test

test/propagate_constant_test.cpp

 #include <migraphx/propagate_constant.hpp>
 #include <migraphx/dead_code_elimination.hpp>
 #include <migraphx/op/add.hpp>
+#include <migraphx/op/mul.hpp>
 #include <basic_ops.hpp>
 #include <test.hpp>
 
@@ -60,4 +61,21 @@ TEST_CASE(const_add3)
     EXPECT(p1 == p2);
 }
 
+TEST_CASE(const_add4)
+{
+    migraphx::program p1;
+    auto one  = p1.add_literal(1);
+    auto two  = p1.add_literal(2);
+    auto mul = p1.add_instruction(migraphx::op::mul{}, two, two);
+    auto sum1 = p1.add_instruction(migraphx::op::add{}, one, mul);
+    auto sum2 = p1.add_instruction(migraphx::op::add{}, sum1, two);
+    p1.add_instruction(pass_op{}, sum2);
+    p1.compile(const_prop_target{});
+
+    migraphx::program p2;
+    auto total = p2.add_literal(7);
+    p2.add_instruction(pass_op{}, total);
+    EXPECT(p1 == p2);
+}
+
 int main(int argc, const char* argv[]) { test::run(argc, argv); }