Inc range tests with start == end and neg. step

Add tests with `start == end` for negative (and positive, since it was
missing) step. Also, add inclusive range test with a zero step, and
remove some duplicate test cases.

tests/range0.fut

@@ -5,24 +5,20 @@
 -- input { 1 5 } output { [1i32, 2i32, 3i32, 4i32, 5i32] }
 -- input { 5 1 } error: 5...1
 -- input { 5 0 } error: 5...0
--- input { 0 5 } output { [0i32, 1i32, 2i32,
--- 3i32, 4i32, 5i32] }
 
 -- ==
 -- entry: test1
 -- input { 0 5 } output { [0i32, 1i32, 2i32, 3i32, 4i32] }
 -- input { 1 5 } output { [1i32, 2i32, 3i32, 4i32] }
 -- input { 5 1 } error: 5..<1
 -- input { 5 0 } error: 5..<0
--- input { 0 5 } output { [0i32, 1i32, 2i32, 3i32, 4i32] }
 
 -- ==
 -- entry: test2
 -- input { 0 5 } error: 0..>5
 -- input { 1 5 } error: 1..>5
 -- input { 5 1 } output { [5i32, 4i32, 3i32, 2i32] }
 -- input { 5 0 } output { [5i32, 4i32, 3i32, 2i32, 1i32] }
--- input { 0 5 } error: 0..>5
 
 -- ==
 -- entry: test3
@@ -31,6 +27,9 @@
 -- input { 5 4 1 } output { [5i32, 4i32, 3i32, 2i32, 1i32] }
 -- input { 5 0 0 } output { [5i32, 0i32] }
 -- input { 0 2 5 } output { [0i32, 2i32, 4i32] }
+-- input { 1 1 5 } error: 1..1...5
+-- input { 1 0 1 } output { [1i32] }
+-- input { 1 2 1 } output { [1i32] }
 
 -- ==
 -- entry: test4