Simplify loop building by encoding open/closed bound information in the

HeaderInfo object, and modifying the operator in the loop condition.

The "additional emptiness condition" is no longer necessary with this.
The open/closed property was removed from HeaderInfo in an earlier
commit, but bringing it back in to simplify the loop building makes
more sense.

Also expanded tests for evaluation order of range bounds.

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

@@ -1,6 +1,6 @@
-fun test(): Int {
+fun test(a: Int, b: Int): Int {
     var sum = 0
-    for (i in 1 until 6) {
+    for (i in a until b) {
         sum = sum * 10 + i
     }
     return sum