As shown in KT-44412 (or KT-45319 or KT-17728):
```
fun test5() {
var i = 0
Outer@while (true) {
++i
var j = 0
Inner@do {
++j
} while (if (j >= 3) false else break) // break@Inner
if (i == 3) break
}
}
```
To properly set the loop target for `break` in do-while loop condition,
the loop target for that do-while loop should be ready before parsing
the loop condition.
Previously, Raw FIR loop building configures loop target after visiting
loop conditions. This commit splits the configuration and lets the
builders prepare the loop target for do-while loop only.
This breaks from the loop itself which is inconsistent with
what happens for breaks in while conditions.
Also, the frontend will report that code after the loop is
unreachable, which it isn't. :-\
However, those issues are covered in
https://youtrack.jetbrains.com/issue/KT-17728, so for now
we follow the old backend to not "break" anyone. :)
Fixes KT-44412
Jinseong Jeon