samples: add Terra samples

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

samples/Terra/sintable.t

@@ -0,0 +1,17 @@
+local N = 32
+local tbl = terralib.new(float[N])
+for i = 1,N do
+	tbl[i-1] = math.sin( 2 * math.pi * (i-1)/N)
+end
+
+local ctable = terralib.constant(tbl)
+
+terra sintable(a : float) : float
+	var idx = int(a / (2 * math.pi) * N) 
+	return ctable[idx]
+end
+
+sintable:disas()
+
+print(sintable(0))
+print(sintable(math.pi/4))