SWDEV-395559 - Test to check __half2_raw can be initialized without designator. (#268)

Change-Id: I6dc15074c77b19791babc85c4b32eaa9c1c808d5

[ROCm/hip-tests commit: 71bab0ef2f]

projects/hip-tests/catch/unit/deviceLib/vectorTypesDevice.cc

@@ -267,3 +267,7 @@ TEST_CASE("Unit_vectorTypes_CompileTest") {
   HIP_CHECK(hipFree(ptr));
   REQUIRE(passed == true);
 }
+//Test to check __half2_raw can be initialized without designator
+TEST_CASE("Unit_half2_raw_def") {
+  constexpr __half2_raw inf = {0x7C00,0x7C00};
+}