[IR] Generify lowerings

#KT-1179

core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionClassDescriptor.kt

@@ -88,6 +88,7 @@ class FunctionClassDescriptor(
     override fun getSource(): SourceElement = SourceElement.NO_SOURCE
     override fun getSealedSubclasses() = emptyList<ClassDescriptor>()
     override fun getInlineClassRepresentation(): InlineClassRepresentation<SimpleType>? = null
+    override fun getMultiFieldValueClassRepresentation(): MultiFieldValueClassRepresentation<SimpleType>? = null
 
     override fun getDeclaredTypeParameters() = parameters
 

core/descriptors/src/org/jetbrains/kotlin/descriptors/ClassDescriptor.java

@@ -104,6 +104,9 @@ public interface ClassDescriptor extends ClassifierDescriptorWithTypeParameters,
     @Nullable
     InlineClassRepresentation<SimpleType> getInlineClassRepresentation();
 
+    @Nullable
+    MultiFieldValueClassRepresentation<SimpleType> getMultiFieldValueClassRepresentation();
+
     @NotNull
     @Override
     ClassDescriptor getOriginal();

core/descriptors/src/org/jetbrains/kotlin/descriptors/NotFoundClasses.kt

@@ -85,6 +85,7 @@ class NotFoundClasses(private val storageManager: StorageManager, private val mo
         override fun getCompanionObjectDescriptor(): ClassDescriptor? = null
         override fun getSealedSubclasses(): Collection<ClassDescriptor> = emptyList()
         override fun getInlineClassRepresentation(): InlineClassRepresentation<SimpleType>? = null
+        override fun getMultiFieldValueClassRepresentation(): MultiFieldValueClassRepresentation<SimpleType>? = null
 
         override fun toString() = "class $name (not found)"
     }

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/ClassDescriptorImpl.java

@@ -181,4 +181,10 @@ public class ClassDescriptorImpl extends ClassDescriptorBase {
     public InlineClassRepresentation<SimpleType> getInlineClassRepresentation() {
         return null;
     }
+
+    @Nullable
+    @Override
+    public MultiFieldValueClassRepresentation<SimpleType> getMultiFieldValueClassRepresentation() {
+        return null;
+    }
 }

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/EnumEntrySyntheticClassDescriptor.java

@@ -199,6 +199,12 @@ public class EnumEntrySyntheticClassDescriptor extends ClassDescriptorBase {
         return null;
     }
 
+    @Nullable
+    @Override
+    public MultiFieldValueClassRepresentation<SimpleType> getMultiFieldValueClassRepresentation() {
+        return null;
+    }
+
     private class EnumEntryScope extends MemberScopeImpl {
         private final MemoizedFunctionToNotNull<Name, Collection<? extends SimpleFunctionDescriptor>> functions;
         private final MemoizedFunctionToNotNull<Name, Collection<? extends PropertyDescriptor>> properties;

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/LazySubstitutingClassDescriptor.java

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.descriptors.impl;
 
+import kotlin.Pair;
 import kotlin.collections.CollectionsKt;
 import kotlin.jvm.functions.Function1;
 import org.jetbrains.annotations.NotNull;
@@ -328,10 +329,27 @@ public class LazySubstitutingClassDescriptor extends ModuleAwareClassDescriptor
         //noinspection ConstantConditions
         return representation == null ? null : new InlineClassRepresentation<SimpleType>(
                 representation.getUnderlyingPropertyName(),
-                substituteSimpleType(getInlineClassRepresentation().getUnderlyingType())
+                substituteSimpleType(representation.getUnderlyingType())
         );
     }
 
+    @Nullable
+    @Override
+    public MultiFieldValueClassRepresentation<SimpleType> getMultiFieldValueClassRepresentation() {
+        MultiFieldValueClassRepresentation<SimpleType> representation = original.getMultiFieldValueClassRepresentation();
+        if (representation == null) {
+            return null;
+        }
+        List<Pair<Name, SimpleType>> underlyingList = new ArrayList<Pair<Name, SimpleType>>(representation.getUnderlyingPropertyNamesToTypes());
+        for (int i = 0; i < underlyingList.size(); i++) {
+            Pair<Name, SimpleType> pair = underlyingList.get(i);
+            Name name = pair.getFirst();
+            SimpleType simpleType = pair.getSecond();
+            underlyingList.set(i, new Pair<Name, SimpleType>(name, substituteSimpleType(simpleType)));
+        }
+        return new MultiFieldValueClassRepresentation<SimpleType>(underlyingList);
+    }
+
     @Nullable
     @Override
     public SimpleType getDefaultFunctionTypeForSamInterface() {

core/descriptors/src/org/jetbrains/kotlin/descriptors/impl/MutableClassDescriptor.java

@@ -195,6 +195,12 @@ public class MutableClassDescriptor extends ClassDescriptorBase {
         return null;
     }
 
+    @Nullable
+    @Override
+    public MultiFieldValueClassRepresentation<SimpleType> getMultiFieldValueClassRepresentation() {
+        return null;
+    }
+
     @Override
     public String toString() {
         return DeclarationDescriptorImpl.toString(this);