== unreachable ==
fun unreachable() {}
---------------------
=====================
== a ==
fun a() {
    do {
    } while (true)
    unreachable()
}
---------------------
                                        <v1>: *   NEW: magic[VALUE_CONSUMER](true|<v0>) -> <v1>
true                                    <v0>: *   NEW: r(true) -> <v0>
unreachable()                           <v2>: *   NEW: call(unreachable(), unreachable) -> <v2>
{ do { } while (true) unreachable() }   <v2>: *   COPY
=====================
== b ==
fun b() {
    while (true) {
    }
    unreachable()
}
---------------------
                                     <v1>: *         NEW: magic[VALUE_CONSUMER](true|<v0>) -> <v1>
true                                 <v0>: Boolean   NEW: r(true) -> <v0>
unreachable()                        <v2>: *         NEW: call(unreachable(), unreachable) -> <v2>
{ while (true) { } unreachable() }   <v2>: *         COPY
=====================