samples: add Terra samples

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

samples/Terra/call.t

@@ -0,0 +1,53 @@
+
+terra bar(a : int, b : int) : int
+    return a + b
+end
+terra foo(a : int,b : int) : int
+    return bar(a,b) + 1
+end
+
+terra baz(a : int, b : int) : int
+    var f,c,d = 4,baz2(a,b)
+    return f + c + d
+end and
+terra baz2(a : int, b : int) : {int, int}
+    return a + 1, b + 2
+end
+
+terra two(a : int, b : int) : int
+    return a + b
+end
+terra baz3() : int
+    var a,b = baz2(1,2)
+    return two(a,b)
+end
+terra baz4() : int
+    return two(5,(baz2(1,2))._0)
+end
+
+terra baz5()
+    var a,b = baz2(0,0)
+    return 1,2,a,b
+end
+
+terra baz6()
+    var a,b,c,d = baz5()
+    var e = (baz5()._0)
+    return a + b + c + d + e
+end
+
+terra baz7(a : int)
+    if a < 3 then
+        return 1,(baz5())._0
+    else
+        return 100,2
+    end
+end
+local test = require("test")
+
+test.eq(foo(2,3),6)
+test.eq(baz(1,2),10)
+test.eq(baz3(),6)
+test.eq(baz4(),7)
+test.eq(baz6(),7)
+test.meq({100,2},baz7(10))