Disable small copy optimization for now

Change-Id: Ib7a4aa676bb60940e067c985eb19070bd63b2fc2


[ROCm/clr commit: 0fbc0a895b]

projects/clr/rocclr/device/rocm/rocdevice.cpp

@@ -906,7 +906,8 @@ hsa_status_t Device::iterateGpuMemoryPoolCallback(hsa_amd_memory_pool_t pool, vo
           if (tmp == HSA_AMD_MEMORY_POOL_ACCESS_NEVER_ALLOWED) {
             dev->info_.largeBar_ = false;
           } else {
-            dev->info_.largeBar_ = true;
+            // Disable smallCopy optimization for now
+            dev->info_.largeBar_ = false;
           }
         }