Simplify data class function generation and signature lookup code

- change prerequisites for generating equals/hashCode/toString in a data class:
  previously they were generated if the corresponding method is trivial (i.e.
  it comes from kotlin.Any), now we're generating it always unless it'll cause
  a JVM signature clash error (see KT-6206)
- use static KotlinBuiltIns.isXxx methods to compare types instead of checking
  against descriptors loaded from certain built-ins instance, this is quicker
  and more correct in environments where several built-ins are possible
- don't use isOrOverridesSynthesized, it's not relevant for
  equals/hashCode/toString because functions with these names are never
  synthesized

 #KT-6206 Fixed

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

@@ -4123,6 +4123,18 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("nonTrivialFinalMemberInSuperClass.kt")
+        public void testNonTrivialFinalMemberInSuperClass() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/dataClasses/nonTrivialFinalMemberInSuperClass.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("nonTrivialMemberInSuperClass.kt")
+        public void testNonTrivialMemberInSuperClass() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/dataClasses/nonTrivialMemberInSuperClass.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("privateValParams.kt")
         public void testPrivateValParams() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/dataClasses/privateValParams.kt");