KT-6916 Slow bytecode for downTo iteration like for (i in max downTo min)

#KT-6916 fixed

compiler/testData/codegen/bytecodeText/forLoop/primitiveLiteralRange2.kt

@@ -0,0 +1,8 @@
+fun f(a: Int, b: Int) {
+    for (i in a..b) {
+    }
+}
+
+// 0 iterator
+// 0 getStart
+// 0 getEnd