FIR DFA: isolate effects between blocks in try expression

compiler/testData/diagnostics/testsWithStdLib/contracts/smartcasts/catchExceptionSpilling.fir.kt

@@ -17,5 +17,5 @@ fun testWithCatch(x: Any?) {
         x.length
     } catch (e: java.lang.IllegalArgumentException) { }
 
-    x.length
+    x.<!UNRESOLVED_REFERENCE!>length<!>
 }

compiler/testData/diagnostics/testsWithStdLib/contracts/smartcasts/throwsEffect.fir.kt

@@ -45,7 +45,7 @@ fun testTryCatch(x: Any?) {
     } catch (e: kotlin.IllegalArgumentException) {
 
     }
-    x.length
+    x.<!UNRESOLVED_REFERENCE!>length<!>
 }
 
 fun testUncertainFlow(x: Any?) {