Kotlin: Fix array indexer extraction

Author: tamasvajk

java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt

@@ -2185,7 +2185,7 @@ open class KotlinFileExtractor(
                         }
                     }
                 }
-                isFunction(target, "kotlin", "(some array type)", { isArrayType(it) }, "get") && c.origin == IrStatementOrigin.GET_ARRAY_ELEMENT -> {
+                isFunction(target, "kotlin", "(some array type)", { isArrayType(it) }, "get") && c.origin == IrStatementOrigin.GET_ARRAY_ELEMENT && c.dispatchReceiver != null -> {
                     val id = tw.getFreshIdLabel<DbArrayaccess>()
                     val type = useType(c.type)
                     tw.writeExprs_arrayaccess(id, type.javaResult.id, parent, idx)

java/ql/test/kotlin/library-tests/operator-overloads/PrintAst.expected

@@ -18,8 +18,11 @@ test.kt:
 #    3|         1: [ExprStmt] <Expr>;
 #    3|           0: [ImplicitCoercionToUnitExpr] <implicit coercion to unit>
 #    3|             0: [TypeAccess] Unit
-#    3|             1: [ArrayAccess] ...[...]
+#    3|             1: [MethodAccess] get(...)
+#    3|               -1: [TypeAccess] TestKt
+#    3|               0: [VarAccess] arr
 #    3|               1: [IntegerLiteral] 1
+#    3|               2: [IntegerLiteral] 2
 #    4|         2: [ExprStmt] <Expr>;
 #    4|           0: [ImplicitCoercionToUnitExpr] <implicit coercion to unit>
 #    4|             0: [TypeAccess] Unit

java/ql/test/kotlin/library-tests/operator-overloads/test.expected

@@ -1,2 +0,0 @@
-| test.kt:3:5:3:13 | Dispatch receiver not found |
-| test.kt:3:5:3:13 | Extra arguments found |