FIR CFG: route to exit of try main for throw in try main

to make the remaining part of try main marked as dead.

^KT-45475 Fixed

compiler/testData/diagnostics/tests/smartCasts/throwInTry.fir.kt

@@ -40,7 +40,7 @@ fun conditionalThrowInTry_smartcastInTry(a: A) {
         if (a !is B) {
             throw AssertionError()
         }
-        <!INAPPLICABLE_CANDIDATE!>takeB<!>(a)
+        takeB(a)
     } catch (e: Throwable) {}
 }