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/tests/org/jetbrains/jet/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -5106,11 +5106,6 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("compiler/testData/codegen/box/typeMapping"), Pattern.compile("^(.+)\\.kt$"), true);
         }
         
-        @TestMetadata("hashable.kt")
-        public void testHashable() throws Exception {
-            doTest("compiler/testData/codegen/box/typeMapping/hashable.kt");
-        }
-        
         @TestMetadata("kt2831.kt")
         public void testKt2831() throws Exception {
             doTest("compiler/testData/codegen/box/typeMapping/kt2831.kt");

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -908,11 +908,6 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
             doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/getGenericInterfaces.kt");
         }
         
-        @TestMetadata("implicitlyCastToHashable.kt")
-        public void testImplicitlyCastToHashable() throws Exception {
-            doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/implicitlyCastToHashable.kt");
-        }
-        
         @TestMetadata("kt1406.kt")
         public void testKt1406() throws Exception {
             doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/kt1406.kt");