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

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/blackboxtest/NativeCodegenBoxTestGenerated.java

@@ -3553,6 +3553,12 @@ public class NativeCodegenBoxTestGenerated extends AbstractNativeCodegenBoxTest
                 runTest("compiler/testData/codegen/box/casts/kt54707.kt");
             }
 
+            @Test
+            @TestMetadata("kt54802.kt")
+            public void testKt54802() throws Exception {
+                runTest("compiler/testData/codegen/box/casts/kt54802.kt");
+            }
+
             @Test
             @TestMetadata("lambdaToUnitCast.kt")
             public void testLambdaToUnitCast() throws Exception {