KJS IR: Fix KT-45738 - Consider recursive checkForPrimitiveOrPattern

Recursive results from checkForPrimitiveOrPattern were ignored. If it found a case/condition that could not be optimized the resulting "false" was not propagated. This would lead to a "optimized" when without all conditions.
- see KT-45738
- The return is now lifted out of the when to make it more obvious what is going on.
- New test for mixed multiple conditions in when

compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -33494,6 +33494,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/when/switchOptimizationMultipleConditions.kt");
         }
 
+        @TestMetadata("switchOptimizationMultipleMixedConditions.kt")
+        public void testSwitchOptimizationMultipleMixedConditions() throws Exception {
+            runTest("compiler/testData/codegen/box/when/switchOptimizationMultipleMixedConditions.kt");
+        }
+
         @TestMetadata("switchOptimizationSingleStatementCase.kt")
         public void testSwitchOptimizationSingleStatementCase() throws Exception {
             runTest("compiler/testData/codegen/box/when/switchOptimizationSingleStatementCase.kt");