Update IEEE 754 'equals' tests for LV 1.2

NB IEEE 754 doesn't say anything about nulls.

compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCall.kt

@@ -1,3 +1,4 @@
+// LANGUAGE_VERSION: 1.1
 // FILE: JavaClass.java
 
 public class JavaClass {

compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCall_lv12.kt

@@ -0,0 +1,27 @@
+// LANGUAGE_VERSION: 1.2
+// FILE: JavaClass.java
+
+public class JavaClass {
+
+    public Double minus0(){
+        return -0.0;
+    }
+
+    public Double plus0(){
+        return 0.0;
+    }
+
+}
+
+
+// FILE: b.kt
+
+fun box(): String {
+    val jClass = JavaClass()
+
+    if (jClass.minus0().equals(jClass.plus0())) return "fail 1"
+    if (jClass.plus0().equals(jClass.minus0())) return "fail 2"
+
+    return "OK"
+}
+

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxAgainstJavaCodegenTestGenerated.java

@@ -335,6 +335,12 @@ public class BlackBoxAgainstJavaCodegenTestGenerated extends AbstractBlackBoxAga
             doTest(fileName);
         }
 
+        @TestMetadata("explicitEqualsCall_lv12.kt")
+        public void testExplicitEqualsCall_lv12() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/boxAgainstJava/ieee754/explicitEqualsCall_lv12.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("float.kt")
         public void testFloat() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/boxAgainstJava/ieee754/float.kt");