Drop identityEquals from builtins, compiler and tests.

core/builtins/native/kotlin/Library.kt

@@ -16,13 +16,6 @@
 
 package kotlin
 
-/**
- * Returns true if the receiver and the [other] object are the same object instance, or if they
- * are both null.
- */
-@Deprecated("This function is deprecated, use === instead", ReplaceWith("this === other"))
-public fun Any?.identityEquals(other: Any?): Boolean // = this === other
-
 /**
  * Returns a string representation of the object. Can be called with a null receiver, in which case
  * it returns the string "null".

core/descriptors/src/org/jetbrains/kotlin/builtins/KotlinBuiltIns.java

@@ -1176,15 +1176,5 @@ public abstract class KotlinBuiltIns {
         return getNullableAnyType();
     }
 
-    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
-    // GET FUNCTION
-
-    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-
-    @NotNull
-    public FunctionDescriptor getIdentityEquals() {
-        return first(getBuiltInsPackageFragment().getMemberScope().getContributedFunctions(Name.identifier("identityEquals"),
-                                                                                           NoLookupLocation.FROM_BUILTINS));
-    }
 }

core/descriptors/src/org/jetbrains/kotlin/util/OperatorNameConventions.kt

@@ -23,7 +23,6 @@ object OperatorNameConventions {
     @JvmField val SET_VALUE = Name.identifier("setValue")
 
     @JvmField val EQUALS = Name.identifier("equals")
-    @JvmField val IDENTITY_EQUALS = Name.identifier("identityEquals")
     @JvmField val COMPARE_TO = Name.identifier("compareTo")
     @JvmField val CONTAINS = Name.identifier("contains")
     @JvmField val INVOKE = Name.identifier("invoke")