[FIR] Don't assume that exit lambda node is target for exceptional exit for inplace lambdas

#KT-39709 Fixed
#KT-43156 Fixed

compiler/testData/diagnostics/testsWithStdLib/contracts/controlflow/initialization/exactlyOnce/valDefiniteInitialization.fir.kt

@@ -98,7 +98,7 @@ class DefiniteInitializationAfterThrow {
             if (bar()) throw RuntimeException()
             a = 42
         }
-        <!UNINITIALIZED_VARIABLE!>a<!>.hashCode()
+        a.hashCode()
     }
     fun bar() = false
 }