Keep track of array types in OptimizationBasicInterpreter

Merging array types with different element types, for example
`[Lj/l/String;` and `[Lj/l/Object;`, now produces `[Lj/l/Object;`
(instead of `Lj/l/Object;`), which allows for more precise tracking of
null values because we assume that AALOAD on a non-array typed value is
possible only if that value is null.

 #KT-54802 Fixed

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

@@ -3958,11 +3958,6 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)
     public static class Casts extends AbstractLightAnalysisModeTest {
-        @TestMetadata("kt54707.kt")
-        public void ignoreKt54707() throws Exception {
-            runTest("compiler/testData/codegen/box/casts/kt54707.kt");
-        }
-
         private void runTest(String testDataFilePath) throws Exception {
             KotlinTestUtils.runTest(this::doTest, TargetBackend.JVM, testDataFilePath);
         }
@@ -4096,6 +4091,16 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/casts/kt54581.kt");
         }
 
+        @TestMetadata("kt54707.kt")
+        public void testKt54707() throws Exception {
+            runTest("compiler/testData/codegen/box/casts/kt54707.kt");
+        }
+
+        @TestMetadata("kt54802.kt")
+        public void testKt54802() throws Exception {
+            runTest("compiler/testData/codegen/box/casts/kt54802.kt");
+        }
+
         @TestMetadata("lambdaToUnitCast.kt")
         public void testLambdaToUnitCast() throws Exception {
             runTest("compiler/testData/codegen/box/casts/lambdaToUnitCast.kt");