Read package name in KotlinClassHeader and use it in decompiler

(cherry picked from commit 119d5ab)

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

@@ -30,7 +30,8 @@ class KotlinClassHeader(
         val incompatibleData: Array<String>?,
         val strings: Array<String>?,
         val extraString: String?,
-        val extraInt: Int
+        val extraInt: Int,
+        val packageName: String?
 ) {
     // See kotlin.Metadata
     enum class Kind(val id: Int) {

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

@@ -52,6 +52,7 @@ public class ReadKotlinClassHeaderAnnotationVisitor implements AnnotationVisitor
     private JvmBytecodeBinaryVersion bytecodeVersion = null;
     private String extraString = null;
     private int extraInt = 0;
+    private String packageName = null;
     private String[] data = null;
     private String[] strings = null;
     private String[] incompatibleData = null;
@@ -84,7 +85,8 @@ public class ReadKotlinClassHeaderAnnotationVisitor implements AnnotationVisitor
                 incompatibleData,
                 strings,
                 extraString,
-                extraInt
+                extraInt,
+                packageName
         );
     }
 
@@ -153,6 +155,11 @@ public class ReadKotlinClassHeaderAnnotationVisitor implements AnnotationVisitor
                     extraInt = (Integer) value;
                 }
             }
+            else if (METADATA_PACKAGE_NAME_FIELD_NAME.equals(string)) {
+                if (value instanceof String) {
+                    packageName = (String) value;
+                }
+            }
         }
 
         @Override