Add ability to set up source element when copying descriptor

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/sam/SamAdapterFunctionDescriptor.java

@@ -21,6 +21,7 @@ import org.jetbrains.annotations.Nullable;
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor;
 import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor;
+import org.jetbrains.kotlin.descriptors.SourceElement;
 import org.jetbrains.kotlin.descriptors.annotations.Annotations;
 import org.jetbrains.kotlin.load.java.descriptors.JavaMethodDescriptor;
 import org.jetbrains.kotlin.load.java.descriptors.SamAdapterDescriptor;
@@ -58,7 +59,7 @@ import org.jetbrains.kotlin.name.Name;
             @NotNull Kind kind,
             @Nullable Name newName,
             @NotNull Annotations annotations,
-            boolean preserveSource
+            @NotNull SourceElement source
     ) {
         return new SamAdapterFunctionDescriptor(newOwner, (SimpleFunctionDescriptor) original, kind, declaration);
     }

compiler/frontend.java/src/org/jetbrains/kotlin/synthetic/SamAdapterFunctionsScope.kt

@@ -147,7 +147,7 @@ class SamAdapterFunctionsScope(storageManager: StorageManager) : SyntheticScope
                 kind: CallableMemberDescriptor.Kind,
                 newName: Name?,
                 annotations: Annotations,
-                preserveSource: Boolean
+                source: SourceElement
         ): MyFunctionDescriptor {
             return MyFunctionDescriptor(
                     containingDeclaration, original as SimpleFunctionDescriptor?, annotations, newName ?: name, kind, source