sentinel pointers and c strings

examples/programs/sentinel_pointer/main.bro

@@ -0,0 +1,8 @@
+main :: func() i32 {
+	values [2;0]i32 :: [101, 101]
+	array_pointer :: &values
+	suffix [;0]i32 :: array_pointer[1..]
+	ordinary []i32 :: suffix
+	pointer [*;0]i32 :: suffix.ptr
+	return array_pointer[0] + pointer[0] + ordinary[0]
+}