Provide DescriptorUtils.isAnonymousFunction (for IR-based BE)

compiler/frontend/src/org/jetbrains/kotlin/descriptors/impl/AnonymousFunctionDescriptor.java

@@ -20,7 +20,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor;
 import org.jetbrains.kotlin.descriptors.SourceElement;
 import org.jetbrains.kotlin.descriptors.annotations.Annotations;
-import org.jetbrains.kotlin.name.Name;
+import org.jetbrains.kotlin.name.SpecialNames;
 
 public class AnonymousFunctionDescriptor extends SimpleFunctionDescriptorImpl {
     private final boolean isSuspend;
@@ -32,7 +32,7 @@ public class AnonymousFunctionDescriptor extends SimpleFunctionDescriptorImpl {
             @NotNull SourceElement source,
             boolean isSuspend
     ) {
-        super(containingDeclaration, null, annotations, Name.special("<anonymous>"), kind, source);
+        super(containingDeclaration, null, annotations, SpecialNames.ANONYMOUS_FUNCTION, kind, source);
         this.isSuspend = isSuspend;
     }
 

compiler/frontend/src/org/jetbrains/kotlin/psi/KtFunctionLiteral.java

@@ -24,6 +24,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.kotlin.lexer.KtTokens;
 import org.jetbrains.kotlin.name.FqName;
+import org.jetbrains.kotlin.name.SpecialNames;
 
 public class KtFunctionLiteral extends KtFunctionNotStubbed {
     public KtFunctionLiteral(@NotNull ASTNode node) {
@@ -37,7 +38,7 @@ public class KtFunctionLiteral extends KtFunctionNotStubbed {
 
     @Override
     public String getName() {
-        return "<anonymous>";
+        return SpecialNames.ANONYMOUS;
     }
 
     @Override

core/descriptors/src/org/jetbrains/kotlin/name/SpecialNames.java

@@ -31,6 +31,9 @@ public class SpecialNames {
     // The name contains a GUID to avoid clashes, if a clash happens, it's not a big deal: the code does not compile anyway
     public static final Name SAFE_IDENTIFIER_FOR_NO_NAME = Name.identifier("no_name_in_PSI_3d19d79d_1ba9_4cd0_b7f5_b46aa3cd5d40");
 
+    public static final String ANONYMOUS = "<anonymous>";
+    public static final Name ANONYMOUS_FUNCTION = Name.special(ANONYMOUS);
+
     @NotNull
     public static Name safeIdentifier(@Nullable Name name) {
         return name != null && !name.isSpecial() ? name : SAFE_IDENTIFIER_FOR_NO_NAME;

core/descriptors/src/org/jetbrains/kotlin/resolve/DescriptorUtils.java

@@ -284,6 +284,12 @@ public class DescriptorUtils {
         return isClass(descriptor) && descriptor.getName().equals(SpecialNames.NO_NAME_PROVIDED);
     }
 
+    @SuppressWarnings("unused")
+    public static boolean isAnonymousFunction(@NotNull DeclarationDescriptor descriptor) {
+        return descriptor instanceof SimpleFunctionDescriptor &&
+               descriptor.getName().equals(SpecialNames.ANONYMOUS_FUNCTION);
+    }
+
     public static boolean isNonCompanionObject(@NotNull DeclarationDescriptor descriptor) {
         return isKindOf(descriptor, ClassKind.OBJECT) && !((ClassDescriptor) descriptor).isCompanionObject();
     }