[MCOMPILER-485] Call ClassWriter#visit before ClassWriter#visitSource

Javadocs for org.objectweb.asm.ClassVisitor specify "The methods of this
class must be called in the following order: visit [ visitSource ] ..."

Author: dbwiddis

src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java

@@ -1369,10 +1369,10 @@ private byte[] generatePackage( CompilerConfiguration compilerConfiguration, Str
             internalPackageName = internalPackageName.replace( File.separatorChar, '/' );
         }
         ClassWriter cw = new ClassWriter( 0 );
-        cw.visitSource( "package-info.java", null );
         cw.visit( version,
                 Opcodes.ACC_SYNTHETIC | Opcodes.ACC_ABSTRACT | Opcodes.ACC_INTERFACE,
                 internalPackageName, null, "java/lang/Object", null );
+        cw.visitSource( "package-info.java", null );
         return cw.toByteArray();
     }