[FE 1.0] Fix false-negative INVALID_IF_AS_EXPRESSION_WARNING and NO_ELSE_IN_WHEN_WARNING

^KT-51711 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -6386,6 +6386,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/controlStructures/kt4310.kt");
             }
 
+            @Test
+            @TestMetadata("kt51711.kt")
+            public void testKt51711() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/controlStructures/kt51711.kt");
+            }
+
             @Test
             @TestMetadata("kt657.kt")
             public void testKt657() throws Exception {