Delete Hashable, pull up its members to Any

Extensions on nullable types remain in Library.kt

 #KT-1741 Obsolete
 #KT-2805 Obsolete
 #KT-1365 Fixed
 #KT-4517 In Progress

compiler/testData/diagnostics/tests/BinaryCallsOnNullableValues.kt

@@ -1,13 +1,5 @@
 class A() {
-  fun equals(<!UNUSED_PARAMETER!>a<!> : Any?) : Boolean = false
-}
-
-class B() {
-  fun equals(<!UNUSED_PARAMETER!>a<!> : Any?) : Boolean? = false
-}
-
-class C() {
-  fun equals(<!UNUSED_PARAMETER!>a<!> : Any?) : Int = 0
+  override fun equals(other : Any?) : Boolean = false
 }
 
 fun f(): Unit {
@@ -22,8 +14,6 @@ fun f(): Unit {
   x != 1
 
   <!EQUALITY_NOT_APPLICABLE!>A() == 1<!>
-  B() <!RESULT_TYPE_MISMATCH!>==<!> 1
-  C() <!RESULT_TYPE_MISMATCH!>==<!> 1
 
   <!EQUALITY_NOT_APPLICABLE!>x === "1"<!>
   <!EQUALITY_NOT_APPLICABLE!>x !== "1"<!>

compiler/testData/diagnostics/tests/cast/IsErasedAllowFromOut.kt

@@ -1 +1 @@
-fun f(a: MutableList<out Number>) = a is MutableList<out Hashable>
+fun f(a: MutableList<out Number>) = a is MutableList<out Any>

compiler/testData/diagnostics/tests/cast/IsErasedAllowFromOutAtClass.kt

@@ -1 +1 @@
-fun f(a: List<Number>) = a is List<Hashable>
+fun f(a: List<Number>) = a is List<Any>

compiler/testData/diagnostics/tests/cast/IsErasedDisallowFromOutAtClass.kt

@@ -1 +1 @@
-fun f(a: List<Hashable>) = a is <!CANNOT_CHECK_FOR_ERASED!>List<Number><!>
+fun f(a: List<Any>) = a is <!CANNOT_CHECK_FOR_ERASED!>List<Number><!>

compiler/testData/diagnostics/tests/j+k/SupertypeArgumentsNullability-UserTypes.kt

@@ -15,7 +15,7 @@ public class Y extends X<A> {
 // FILE: test.kt
 
 fun main() {
-    Y().foo()<!UNSAFE_CALL!>.<!>hashCode()
+    Y().foo()<!UNSAFE_CALL!>.<!>wait()
     Y().bar(null)
 }
 

compiler/testData/diagnostics/tests/thisAndSuper/superInExtensionFunctionCall.kt

@@ -1,6 +1,6 @@
 // No supertype at all
 class A1 {
     fun test() {
-        <!SUPER_IS_NOT_AN_EXPRESSION!>super<!>.equals(null) // Call to an extension function
+        <!SUPER_IS_NOT_AN_EXPRESSION!>super<!>.identityEquals(null) // Call to an extension function
     }
 }