[FE] Make dynamic a suitable resulted type

This fixes a FIR-specific issue where a type variable is inferred to
Any instead of dynamic. K1 wasn't affected because of a FIR-specific
condition in ResultTypeResolver.

#KT-57962 Fixed

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirPsiJsOldFrontendDiagnosticsTestGenerated.java

@@ -374,6 +374,12 @@ public class FirPsiJsOldFrontendDiagnosticsTestGenerated extends AbstractFirPsiJ
             runTest("compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/reified.kt");
         }
 
+        @Test
+        @TestMetadata("setOperatorOnDynamic.kt")
+        public void testSetOperatorOnDynamic() throws Exception {
+            runTest("compiler/testData/diagnostics/testsWithJsStdLib/dynamicTypes/setOperatorOnDynamic.kt");
+        }
+
         @Test
         @TestMetadata("smartCast.kt")
         public void testSmartCast() throws Exception {