Decompilation support

- class header reader for KotlinMultifileClass, KotlinMultifileClassPart
- proper implClassName for multifile class members

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/AbstractBinaryClassAnnotationAndConstantLoader.kt

@@ -226,7 +226,8 @@ public abstract class AbstractBinaryClassAnnotationAndConstantLoader<A : Any, C
             nameResolver: NameResolver
     ): KotlinJvmBinaryClass? {
         if (proto.hasExtension(implClassName)) {
-            return kotlinClassFinder.findKotlinClass(ClassId(packageFqName, nameResolver.getName(proto.getExtension(implClassName))))
+            val implClassName = nameResolver.getName(proto.getExtension(implClassName))
+            return kotlinClassFinder.findKotlinClass(ClassId(packageFqName, implClassName))
         }
         return null
     }

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/header/ReadKotlinClassHeaderAnnotationVisitor.java

@@ -120,6 +120,10 @@ public class ReadKotlinClassHeaderAnnotationVisitor implements AnnotationVisitor
                     return new PackageHeaderReader();
                 case FILE_FACADE:
                     return new FileFacadeHeaderReader();
+                case MULTIFILE_CLASS:
+                    return new MultifileClassHeaderReader();
+                case MULTIFILE_CLASS_PART:
+                    return new MultifileClassPartHeaderReader();
                 case SYNTHETIC_CLASS:
                     return new SyntheticClassHeaderReader();
                 default:
@@ -259,6 +263,18 @@ public class ReadKotlinClassHeaderAnnotationVisitor implements AnnotationVisitor
         }
     }
 
+    private class MultifileClassHeaderReader extends HeaderAnnotationArgumentVisitor {
+        public MultifileClassHeaderReader() {
+            super(JvmClassName.byFqNameWithoutInnerClasses(KOTLIN_MULTIFILE_CLASS));
+        }
+    }
+
+    private class MultifileClassPartHeaderReader extends HeaderAnnotationArgumentVisitor {
+        public MultifileClassPartHeaderReader() {
+            super(JvmClassName.byFqNameWithoutInnerClasses(KOTLIN_MULTIFILE_CLASS_PART));
+        }
+    }
+
     private class SyntheticClassHeaderReader extends HeaderAnnotationArgumentVisitor {
         public SyntheticClassHeaderReader() {
             super(KotlinSyntheticClass.CLASS_NAME);