Minor, use incrementType in for-progression codegen

This doesn't fix anything, just makes it easier to figure out values of what
types are used where. Progression increment is of its own type, which may be
different from asmElementType in case of Byte, Char, Short progressions

compiler/testData/codegen/boxWithStdlib/ranges/forByteProgressionWithIntIncrement.kt

@@ -0,0 +1,7 @@
+fun box(): String {
+    for (element in 5.toByte()..1.toByte() step 255) {
+        return "Fail: iterating over an empty progression, element: $element"
+    }
+
+    return "OK"
+}