Add simple rocm test program.

tests/hellorocm/README.commands

@@ -0,0 +1,13 @@
+    $ hipcc simple.cpp -g -O0 -o simple
+    $ ./simple 
+
+
+    $ roc-obj-ls simple
+    $ rocm-smi --showdriverversion
+    $ /opt/rocm/bin/rocminfo | grep gfx
+    $ sudo /opt/rocm/bin/rocminfo --support
+
+    $ export HIP_ENABLE_DEFERRED_LOADING=0
+    $ export AMD_LOG_LEVEL=3
+    $ /usr/local/bin/seergdb --gdb-program=/usr/bin/rocgdb -s ./simple
+

tests/hellorocm/simple.cpp

@@ -0,0 +1,34 @@
+#include "hip/hip_runtime.h"
+#include <cassert>
+#include <cstdio>
+
+__global__
+void do_an_addition (int a, int b, int *out) {
+    *out = a + b;
+}
+
+int main () {
+    int *result_ptr, result;
+
+    /* Allocate memory for the device to write the result to.  */
+    hipError_t error_code = hipMalloc (&result_ptr, sizeof (int));
+
+    printf("HIP Error %d %s: %s.\n", error_code, hipGetErrorName(error_code), hipGetErrorString(error_code));
+    assert (error_code == hipSuccess);
+
+    /* Run `do_an_addition` on one workgroup containing one work item.  */
+    do_an_addition<<<dim3(1), dim3(1), 0, 0>>> (1, 2, result_ptr);
+
+    /* Copy result from device to host.  Note that this acts as a synchronization
+       point, waiting for the kernel dispatch to complete.  */
+    error_code = hipMemcpyDtoH (&result, result_ptr, sizeof (int));
+
+    printf("HIP Error %d %s: %s.\n", error_code, hipGetErrorName(error_code), hipGetErrorString(error_code));
+    assert (error_code == hipSuccess);
+
+    printf ("result is %d\n", result);
+    assert (result == 3);
+
+    return 0;
+}
+