Temporarily comment out Hcc-specific APIs for CLang compiler

Temporarily comment out Hcc-specific template functions
hipExtLaunchKernelGGL and hipOccupancyMaxPotentialBlockSize for CLang
compiler so that all test cases under hip/samples can be built
successfully for Clang + Hip/Hcc runtime.

Change-Id: Iafc761257be4a7b34eafa6759a01f369570cd6ce


[ROCm/hip-tests commit: 6eabd2e7dd]

projects/hip-tests/samples/1_Utils/hipDispatchLatency/hipDispatchLatency.cpp

@@ -109,7 +109,7 @@ int main() {
     /***********************************************************************************/
 
     //Timing directly the dispatch
-#ifdef __HIP_PLATFORM_HCC__
+#if defined(__HIP_PLATFORM_HCC__) && GENERIC_GRID_LAUNCH == 1 && defined(__HCC__)
     for (auto i = 0; i < TOTAL_RUN_COUNT; ++i) {
         hipExtLaunchKernelGGL((EmptyKernel), dim3(NUM_GROUPS), dim3(GROUP_SIZE), 0, stream0, start, stop, 0);
         hipEventSynchronize(stop);

projects/hip-tests/samples/2_Cookbook/13_occupancy/occupancy.cpp

@@ -44,6 +44,8 @@ void multiplyCPU(float* C, float* A, float* B, int N){
     }
 }
 
+#if defined(__HIP_PLATFORM_HCC__) && GENERIC_GRID_LAUNCH == 1 && defined(__HCC__)
+
 void launchKernel(float* C, float* A, float* B, bool manual){
      
      hipDeviceProp_t devProp;
@@ -93,8 +95,10 @@ void launchKernel(float* C, float* A, float* B, bool manual){
 	std::cout << "Theoretical Occupancy is " << (double)numBlock* blockSize/devProp.maxThreadsPerMultiProcessor * 100 << "%" << std::endl;
      }
 }
+#endif
 
 int main() {
+#if defined(__HIP_PLATFORM_HCC__) && GENERIC_GRID_LAUNCH == 1 && defined(__HCC__)
      float *A, *B, *C0, *C1, *cpuC;
      float *Ad, *Bd, *C0d, *C1d;
      int errors=0;
@@ -173,4 +177,8 @@ int main() {
      free(C0);
      free(C1);
      free(cpuC);
+#else
+     std::cout <<"hipOccupancyMaxPotentialBlockSize template not support for Clang compiler"<<std::endl;
+#endif
+     return 0;
 }