Mark operands of POP2 as don't touch in unused expression elimination

Fixes KT-20879.

compiler/testData/codegen/box/ranges/contains/comparisonWithRangeBoundEliminated.kt

@@ -0,0 +1,23 @@
+fun abs(x: Int) = if (x < 0) -x else x
+fun abs(x: Long) = if (x < 0) -x else x
+
+fun test1() =
+        5 in abs(-1) .. 10
+
+fun test2() =
+        5 in 1 .. abs(-10)
+
+fun test3() =
+        5L in abs(-1L) .. 10L
+
+fun test4() =
+        5L in 1L .. abs(-10L)
+
+fun box(): String {
+    if (!test1()) return "Fail 1"
+    if (!test2()) return "Fail 2"
+    if (!test3()) return "Fail 3"
+    if (!test4()) return "Fail 4"
+
+    return "OK"
+}