Re-enable IsHelperLane test since down-conversion is in (#3410)

tools/clang/unittests/HLSL/ExecutionTest.cpp

@@ -10,11 +10,6 @@
 //                                                                           //
 ///////////////////////////////////////////////////////////////////////////////
 
-////////////////////////////////////////////////////////////
-// Define this until fallback implementation is complete.
-#define ISHELPERLANE_PLACEHOLDER
-////////////////////////////////////////////////////////////
-
 #include <algorithm>
 #include <memory>
 #include <array>
@@ -311,9 +306,7 @@ public:
   TEST_METHOD(AtomicsShared64Test);
   TEST_METHOD(AtomicsFloatTest);
   TEST_METHOD(HelperLaneTest);
-  BEGIN_TEST_METHOD(HelperLaneTestWave)
-    TEST_METHOD_PROPERTY(L"Priority", L"2") // Remove this line once warp handles this
-  END_TEST_METHOD()
+  TEST_METHOD(HelperLaneTestWave);
   TEST_METHOD(SignatureResourcesTest)
   TEST_METHOD(DynamicResourcesTest)
   TEST_METHOD(QuadReadTest)