Fix reflection on enhanced Java methods, call getOriginal()

Also use the provided mechanism for binding overrides instead of a custom for
loop, because it also binds corresponding value parameters

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/descriptors/JavaMethodDescriptor.java

@@ -92,8 +92,6 @@ public class JavaMethodDescriptor extends SimpleFunctionDescriptorImpl implement
         return result;
     }
 
-
-
     @Override
     @NotNull
     public JavaMethodDescriptor enhance(
@@ -109,16 +107,11 @@ public class JavaMethodDescriptor extends SimpleFunctionDescriptorImpl implement
         // 2. copies method's type parameters (with new containing declaration) and properly substitute to them in value parameters, return type and etc.
         JavaMethodDescriptor enhancedMethod = (JavaMethodDescriptor) doSubstitute(
                 TypeSubstitutor.EMPTY, getContainingDeclaration(), getModality(), getVisibility(), getOriginal(),
-                /* copyOverrides = */ false, getKind(),
+                /* copyOverrides = */ true, getKind(),
                 enhancedValueParameters, enhancedReceiverType, enhancedReturnType
         );
 
         assert enhancedMethod != null : "null after substitution while enhancing " + toString();
-
-        for (FunctionDescriptor overridden : getOverriddenDescriptors()) {
-            enhancedMethod.addOverriddenDescriptor(overridden);
-        }
-
         return enhancedMethod;
     }
 }

core/reflection.jvm/src/kotlin/reflect/jvm/internal/RuntimeTypeMapper.kt

@@ -37,7 +37,9 @@ import org.jetbrains.kotlin.serialization.jvm.JvmProtoBuf
 import kotlin.reflect.KotlinReflectionInternalError
 
 object RuntimeTypeMapper {
-    fun mapSignature(function: FunctionDescriptor): String {
+    fun mapSignature(possiblySubstitutedFunction: FunctionDescriptor): String {
+        val function = possiblySubstitutedFunction.getOriginal()
+
         if (function is DeserializedCallableMemberDescriptor) {
             val proto = function.proto
             if (!proto.hasExtension(JvmProtoBuf.methodSignature)) {