Added hipHostRegister feature for CUDA backend and its tests

tests/src/hipHostRegister.cpp

@@ -0,0 +1,30 @@
+#include"test_common.h"
+
+__global__ void Inc(hipLaunchParm lp, float *Ad){
+int tx = hipThreadIdx_x + hipBlockIdx_x * hipBlockDim_x;
+Ad[tx] = Ad[tx] + float(1);
+}
+
+int main(){
+	float *A, *Ad;
+	const size_t size = N * sizeof(float);
+	A = (float*)malloc(size);
+	HIPCHECK(hipHostRegister(A, size, 0));
+
+	for(int i=0;i<N;i++){
+		A[i] = float(1);
+	}
+
+	HIPCHECK(hipMalloc(&Ad, size));
+
+	HIPCHECK(hipMemcpy(Ad, A, size, hipMemcpyHostToDevice));
+
+	hipLaunchKernel(HIP_KERNEL_NAME(Inc), dim3(N/512), dim3(512), 0, 0, Ad);
+	HIPCHECK(hipDeviceSynchronize());
+
+	HIPCHECK(hipMemcpy(A, Ad, size, hipMemcpyDeviceToHost));
+
+	HIPASSERT(A[10] == 2.0f);
+	HIPCHECK(hipHostUnregister(A));
+	passed();
+}