Minor, move obsolete test to oldLanguageVersions

Ignore this directory in JVM IR boxAgainstJava tests (similarly to box
tests) so that we can ignore the fact that this test doesn't pass in
JVM_IR, since it shouldn't.

compiler/testData/codegen/boxAgainstJava/oldLanguageVersions/ieee754/explicitEqualsCallNull.kt

@@ -0,0 +1,31 @@
+// !LANGUAGE: -ThrowNpeOnExplicitEqualsForBoxedNull
+// IGNORE_BACKEND: JVM_IR
+// ^ ThrowNpeOnExplicitEqualsForBoxedNull is introduced in 1.2.
+// FILE: JavaClass.java
+
+public class JavaClass {
+
+    public Double minus0(){
+        return -0.0;
+    }
+
+    public Double plus0(){
+        return 0.0;
+    }
+
+    public Double null0(){
+        return null;
+    }
+
+}
+
+
+// FILE: b.kt
+
+fun box(): String {
+    val jClass = JavaClass()
+
+    if (jClass.null0().equals(jClass.plus0())) return "fail 6"
+    if (jClass.minus0().equals(jClass.null0())) return "fail 7"
+    return "OK"
+}