samples: add Terra samples

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

samples/Terra/cudahello.t

@@ -0,0 +1,30 @@
+if not terralib.cudacompile then
+	print("CUDA not enabled, not performing test...")
+	return
+end
+
+local tid = cudalib.nvvm_read_ptx_sreg_tid_x--terralib.intrinsic("llvm.nvvm.read.ptx.sreg.tid.x",{} -> int)
+
+C = terralib.includec("stdio.h")
+vprintf = terralib.externfunction("cudart:vprintf", {&int8,&int8} -> int)
+
+foo = terra(result : &float)
+    var t = tid()
+    vprintf("%d\n",[&int8](&t))
+end
+
+terralib.includepath = terralib.includepath..";/usr/local/cuda/include"
+
+
+sync = terralib.externfunction("cudaThreadSynchronize", {} -> int)
+
+local R = terralib.cudacompile({ bar = foo })
+
+terra doit(N : int)
+	var launch = terralib.CUDAParams { 1,1,1, N,1,1, 0, nil }
+	R.bar(&launch,nil)
+	sync()
+	C.printf("and were done\n")
+end
+
+doit(3)