Add simple JDK15 BlackBox test

^KT-43677 In Progress

compiler/testData/codegen/java15/box/recordDifferentPropertyOverride.kt

@@ -0,0 +1,20 @@
+// FILE: MyRec.java
+public record MyRec(String name) implements KI {
+    public String getName() {
+        return "OK";
+    }
+}
+
+// FILE: main.kt
+
+interface KI {
+    val name: String
+}
+
+fun box(): String {
+    val r = MyRec("fail")
+    if (r.name() != "fail") return "fail 1"
+    if ((r as KI).name != "OK") return "fail 2"
+
+    return r.name
+}

compiler/testData/codegen/java15/box/recordDifferentSyntheticProperty.kt

@@ -0,0 +1,15 @@
+// FILE: MyRec.java
+public record MyRec(String name) {
+    public String getName() {
+        return "OK";
+    }
+}
+
+// FILE: main.kt
+fun box(): String {
+    val r = MyRec("fail")
+    if (r.name() != "fail") return "fail 1"
+    if (r.getName() != "OK") return "fail 2"
+
+    return r.name
+}

compiler/testData/codegen/java15/box/recordPropertyAccess.kt

@@ -0,0 +1,10 @@
+// FILE: MyRec.java
+public record MyRec(String name) {}
+
+// FILE: recordPropertyAccess.kt
+fun box(): String {
+    val r = MyRec("OK")
+    if (r.name() != "OK") return "fail 1"
+
+    return r.name
+}