slt test case.

test/libyul/yulOptimizerTests/reasoningBasedSimplifier/slt.yul

@@ -0,0 +1,19 @@
+{
+    let y := calldataload(0)
+    let t := calldataload(32)
+
+    if sgt(sub(y, 1), y) {
+        // y - 1 > y, i.e. y is the most negative value
+        if eq(y, sub(0, y)) {
+            sstore(0, 1)
+        }
+    }
+}
+// ----
+// step: reasoningBasedSimplifier
+//
+// {
+//     let y := calldataload(0)
+//     let t := calldataload(32)
+//     if sgt(sub(y, 1), y) { if 1 { sstore(0, 1) } }
+// }