simple vector swizzle test (#960)

* initial version, tests vec2 and vec4

* added all types and vector sizes

* fix formatting

* add checks for long and ulong support

* test floats unconditionally, not tied to long support (oops)

* fix for vec3 kernel arguments

* remove generic address space dependency

test_conformance/basic/CMakeLists.txt

@@ -39,6 +39,7 @@ set(${MODULE_NAME}_SOURCES
     test_async_copy.cpp
     test_sizeof.cpp
     test_vector_creation.cpp
+    test_vector_swizzle.cpp
     test_vec_type_hint.cpp
     test_numeric_constants.cpp
     test_constant_source.cpp