samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/cudaoo.t

@@ -0,0 +1,20 @@
+if not terralib.cudacompile then
+    print("CUDA not enabled, not performing test...")
+    return
+end
+C = terralib.includec("cuda_runtime.h")
+
+cudalib.linkruntime()
+
+terra foo()
+    var stuff : &opaque
+    C.cudaMalloc(&stuff,sizeof(int))
+    return stuff
+end
+
+local a = foo()
+
+terra blank() end
+terralib.cudacompile { blank = blank }
+
+assert(0 == C.cudaMemset(a,0,4))