Drop identityEquals from builtins, compiler and tests.

idea/idea-analysis/src/org/jetbrains/kotlin/idea/search/usagesSearch/conventions.kt

@@ -32,7 +32,6 @@ val ALL_SEARCHABLE_OPERATIONS: ImmutableSet<KtToken> = ImmutableSet
         .addAll(ASSIGNMENT_OPERATIONS.keys)
         .addAll(COMPARISON_OPERATIONS)
         .addAll(EQUALS_OPERATIONS)
-        .addAll(IDENTITY_EQUALS_OPERATIONS)
         .addAll(IN_OPERATIONS)
         .add(KtTokens.LBRACKET)
         .add(KtTokens.BY_KEYWORD)
@@ -50,7 +49,6 @@ fun Name.getOperationSymbolsToSearch(): Set<KtToken> {
     when (this) {
         OperatorNameConventions.COMPARE_TO -> return COMPARISON_OPERATIONS_TO_SEARCH
         OperatorNameConventions.EQUALS -> return EQUALS_OPERATIONS
-        OperatorNameConventions.IDENTITY_EQUALS -> return IDENTITY_EQUALS_OPERATIONS
         OperatorNameConventions.CONTAINS -> return IN_OPERATIONS_TO_SEARCH
         OperatorNameConventions.ITERATOR -> return IN_OPERATIONS_TO_SEARCH
         in INDEXING_OPERATION_NAMES -> return setOf(KtTokens.LBRACKET)

idea/src/org/jetbrains/kotlin/idea/intentions/SwapBinaryExpressionIntention.kt

@@ -32,7 +32,7 @@ class SwapBinaryExpressionIntention : SelfTargetingIntention<KtBinaryExpression>
         private val SUPPORTED_OPERATIONS = setOf(PLUS, MUL, OROR, ANDAND, EQEQ, EXCLEQ, EQEQEQ, EXCLEQEQEQ, GT, LT, GTEQ, LTEQ)
 
         private val SUPPORTED_OPERATION_NAMES = SUPPORTED_OPERATIONS.mapNotNull { OperatorConventions.BINARY_OPERATION_NAMES[it]?.asString() }.toSet() +
-                                        setOf("xor", "or", "and", "equals", "identityEquals")
+                                        setOf("xor", "or", "and", "equals")
     }
 
     override fun isApplicableTo(element: KtBinaryExpression, caretOffset: Int): Boolean {

idea/testData/findUsages/kotlin/conventions/identityEquals.0.kt

@@ -1,16 +0,0 @@
-// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtNamedFunction
-// OPTIONS: usages
-// FIND_BY_REF
-
-class A(val n: Int) {
-    override fun equals(other: Any?): Boolean = other is A && other.n == n
-}
-
-fun test() {
-    A(0) == A(1)
-    A(0) != A(1)
-    A(0) equals A(1)
-    A(0) <caret>identityEquals A(1)
-    A(0) === A(1)
-    A(0) !== A(1)
-}

idea/testData/findUsages/kotlin/conventions/identityEquals.results.txt

@@ -1,3 +0,0 @@
-Function call (13: 10) A(0) identityEquals A(1)
-Function call (14: 10) A(0) === A(1)
-Function call (15: 10) A(0) !== A(1)

idea/testData/inspections/cleanup/cleanup.kt

@@ -16,8 +16,6 @@ fun foo() {
     oldFun1(oldFun2(10))
 
     oldFun2()
-
-    1.identityEquals(2)
 }
 
 fun unnecessarySafeCall(x: String) {

idea/testData/inspections/cleanup/cleanup.kt.after

@@ -15,8 +15,6 @@ fun foo() {
     bar(bar(10 + 2) + 1)
 
     oldFun2()
-
-    1 === 2
 }
 
 fun unnecessarySafeCall(x: String) {

idea/tests/org/jetbrains/kotlin/findUsages/FindUsagesTestGenerated.java

@@ -126,12 +126,6 @@ public class FindUsagesTestGenerated extends AbstractFindUsagesTest {
                 doTest(fileName);
             }
 
-            @TestMetadata("identityEquals.0.kt")
-            public void testIdentityEquals() throws Exception {
-                String fileName = KotlinTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/conventions/identityEquals.0.kt");
-                doTest(fileName);
-            }
-
             @TestMetadata("inc.0.kt")
             public void testInc() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("idea/testData/findUsages/kotlin/conventions/inc.0.kt");