Forbid val field initialization inside EXACLTY_ONCE lambda

unless the lambda is inline. This way, final field will remain final.

compiler/fir/analysis-tests/tests/org/jetbrains/kotlin/fir/FirOldFrontendDiagnosticsTestGenerated.java

@@ -3816,6 +3816,11 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirOldFronte
             runTest("compiler/testData/diagnostics/tests/controlFlowAnalysis/fieldAsClassDelegate.kt");
         }
 
+        @TestMetadata("fieldInitialization.kt")
+        public void testFieldInitialization() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/controlFlowAnalysis/fieldInitialization.kt");
+        }
+
         @TestMetadata("infiniteLoops.kt")
         public void testInfiniteLoops() throws Exception {
             runTest("compiler/testData/diagnostics/tests/controlFlowAnalysis/infiniteLoops.kt");