Do not skip synthesized members when generating bridges

The condition here is obsolete since SAM adapters can no longer be overridden:
they are now extensions in another scope

 #KT-12708 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/FunctionCodegen.java

@@ -29,7 +29,6 @@ import org.jetbrains.kotlin.backend.common.bridges.Bridge;
 import org.jetbrains.kotlin.backend.common.bridges.ImplKt;
 import org.jetbrains.kotlin.codegen.annotation.AnnotatedWithOnlyTargetedAnnotations;
 import org.jetbrains.kotlin.codegen.context.*;
-import org.jetbrains.kotlin.codegen.optimization.OptimizationMethodVisitor;
 import org.jetbrains.kotlin.codegen.state.GenerationState;
 import org.jetbrains.kotlin.codegen.state.KotlinTypeMapper;
 import org.jetbrains.kotlin.descriptors.*;
@@ -49,7 +48,6 @@ import org.jetbrains.kotlin.resolve.BindingContext;
 import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils;
 import org.jetbrains.kotlin.resolve.DescriptorUtils;
 import org.jetbrains.kotlin.resolve.annotations.AnnotationUtilKt;
-import org.jetbrains.kotlin.resolve.calls.callResolverUtil.CallResolverUtilKt;
 import org.jetbrains.kotlin.resolve.constants.ArrayValue;
 import org.jetbrains.kotlin.resolve.constants.ConstantValue;
 import org.jetbrains.kotlin.resolve.constants.KClassValue;
@@ -579,9 +577,6 @@ public class FunctionCodegen {
         // equals(Any?), hashCode(), toString() never need bridges
         if (isMethodOfAny(descriptor)) return;
 
-        // If the function doesn't have a physical declaration among super-functions, it's a SAM adapter or alike and doesn't need bridges
-        if (CallResolverUtilKt.isOrOverridesSynthesized(descriptor)) return;
-
         boolean isSpecial = SpecialBuiltinMembers.getOverriddenBuiltinReflectingJvmDescriptor(descriptor) != null;
 
         Set<Bridge<Method>> bridgesToGenerate;

compiler/testData/codegen/box/dataClasses/copy/kt12708.kt

@@ -0,0 +1,13 @@
+fun box(): String {
+    val a: A = B(1)
+    a.copy(1)
+    a.component1()
+    return "OK"
+}
+
+interface A {
+    fun copy(x: Int): A
+    fun component1(): Any
+}
+
+data class B(val x: Int) : A

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

@@ -4374,6 +4374,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("kt12708.kt")
+            public void testKt12708() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/dataClasses/copy/kt12708.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("kt3033.kt")
             public void testKt3033() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/dataClasses/copy/kt3033.kt");